Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab2350a865a3836…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a78de7f4fd3438ba4ffff1ddb7658dda SHA-1: e54c51e88aa51f555dcbe32cae4bbb3ba245f146 SHA-256: aab2350a865a383651593b90fed7e9ca9d599e0cbf875b1a07ecc870f45c114d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which could be used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.dawnrotaryclub.tw/UserFiles/files/wikinikifem.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/75171207347.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/giraxaxafimi.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/kazodiwejepu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bd7ae197---74565926568.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210915202201.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/711354843.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/27873922651.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/vovamuviretazubukib.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wapegedotirigabibitejog.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/bulovijejexoxad.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oitd8ddshbk49lso7ccqd9mv3r/rubobelipotijud.pdfIn PDF document text
    • https://manenshop.com/upload/files/84323381438.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nidoz.pdfIn PDF document text
    • https://mmszke.hu/files/file/78272646746.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qggsuq6c78evc9r62bb8p51392/dipabazinufipijedipana.pdfIn PDF document text
    • http://becucci.it/userfiles/files/22812124306.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/lixagolewin.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ab6ce4cd28ddbd4f78b423aa2a53de12/vamuwepinalava.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/96689137338.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/famaturufojelitajori.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912145513.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161506cf5868d3---62559456405.pdfIn PDF document text
    • https://alariel.be/userfiles/file/87301204566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sat+test+8+pdfPDF 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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 10312 bytes
SHA-256: 1c2d8ad0f8f62f176e4c2dfc3a4f1bfe052f2d951cf55ace8cefd53315fc1f23
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 16608 bytes
SHA-256: a5753ff74d1bfa17f35170ab9cc7569f14c3160673bbc3f768cbdeb88b0f15d8
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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