Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed48785b10cb4d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-20 16:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71ee9203e9a4186bcb6e7dcbde525ddd SHA-1: e34836232cebade9a5a9401b4067c8932e3619f3 SHA-256: c9ed48785b10cb4d7656f4f8944c1de0185801643f7cfe012ebbfbe2aff0e0a8
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a 'Browser Install Lure' and 'ClickFix' attack, by instructing the user to install a fake browser extension or update. The document body is heavily obfuscated, but the heuristics indicate a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a downloader or phishing lure. No scripts were extracted, but the presence of embedded URLs and the nature of the social engineering point towards an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f7aa4a02---24224878692.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/savefupizelemufozixavup.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/banasideluwibabez.pdfIn PDF document text
    • http://hzqzg.com/d/files/sikinapad.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ff315b776bf1526e665e83065c3ec791/70183920072.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5199666939---babizozitemivo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/bifodivatopuputefumamuve.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/monarunis.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mc6gupsj45s98eo81dkcqudq34/93592657283.pdfIn PDF document text
    • http://imi.vc/upload/files/702382735.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d44dfbd7874ffda940aa03ec3c2fd47f/pebeliv.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9c0594d1---zugekowepomowisabawu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22c90542d68ead1cff17ed5cfebf9a43/xuxoxuzelumetisoferipev.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/wudok.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59884e324f---9398057749.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/71877768269.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa618225da---10628204820.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b023af8e3---gufafukibubufumusavigu.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/xitewemanarivotusa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea077ac9---11974616774.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6777417e1---56113590805.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5231a03cb1339efdd842d57a90b76c23/75427259085.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lalitasanilumowexutuzemo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f971fe3b---rutizoxom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb70f067c---kiwafamabolujuwazine.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/6010286521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=snipping+tool+copy+and+pastePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10780 bytes
SHA-256: 33a25178ebb2d9d1fba0419d89d3814ae83df98e59616671f25dcc10dfee0328
font_01_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 17268 bytes
SHA-256: ca2d8c8c012ae429c465767fac4e081f16091fd580e839943bdc85b3b2b24712
font_02_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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