Malicious PDF — malware analysis report

Static analysis result for SHA-256 310551512661e383…

MALICIOUS

PDF

98.6 KB Created: 2021-07-27 10:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5b968bdc277932af6adc69961304b50 SHA-1: ae9548a9505a124cba0e9e7e4a7d7740aaf84b6d SHA-256: 310551512661e3831e6b81f427c27613cd570d2c33454fc5c48030002d95600d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with techniques used to obscure malicious destinations and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • 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 https://motelandratecuci.ro/userfiles/file/jijelidad.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a7d28dc5---45258271415.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/99909128019.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fdbfdae0e6aea7845ea40e551b7e14c4/70025762905.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ja6c31llf34fcbmh9lse748eol/pilodajomorijazik.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb37b8e63---78282524211.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wozidotodija.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/monujamowizefor.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vozevix.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/zetig.pdfIn PDF document text
    • http://davcpundri.com/css/file/sijidezefabavoje.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071913400d0e---gopowijosumedefo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc6c85a3c---bajesejikamesamaketunum.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1627340088.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b857f06c7---mezevore.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/kixozemaputuruzafu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/bc10d06b5cbeac1e24855ac7e6796163/wezukaxinuvojaniv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e97345c166131a11c08e8dbb9de5cd86/10555134999.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0a92c2b0c---60367335664.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zufigalutivexuwed.pdfIn PDF document text
    • https://kopari.hu/files/file/57788724356.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/7675834180.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/98714919283.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50097c5b0---ruwuberonibijapaw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u5ral1fd2fpbb26tbj9j30l658/gusopifemexorowesanoturuj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3649db322d---82104840599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+tall+are+all+the+my+hero+academia+charactersPDF 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_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 10720 bytes
SHA-256: 5fef07cc0ba5112f849b3a4b8937c49b527a84b699fa1c854699d4442db3f9e4
font_02_sfnt_off00014ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC8 17520 bytes
SHA-256: acfeb1677211e48cc579e64cc8bb7bcca02d3b412c6efb44087a12125c998d79

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