Malicious PDF — malware analysis report

Static analysis result for SHA-256 9177204ca3bf67b2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 15:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b10c3962c3c7e09ae4032eaf60262b3 SHA-1: 47a078a84cb0a9ba3c4e500400a4b8a673d5109b SHA-256: 9177204ca3bf67b22d184aaac302caf7204ac36caa0169031ee5efcb12df3fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on compromised CMS uploads or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://pincailight.com/zk/UploadFile/file/2021091217020673499.pdf In PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/73569434260.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/49772951958.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/56883684387.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gudeketu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/zibuxenifetina.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/39551711106.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/46232322296.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6c2df48b---12735628602.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/funenukidimanema.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61e3e223f---gatifid.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/41988904168.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/88282616144.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/37797193434.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/lelimukaka.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/12883530196.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/497589272.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/88129646617.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/91f4d9b41d11c887c473dca8b40dda88/48056255117.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2509f1fc8---bekafa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb71acf9---wesedokazofitopi.pdfIn PDF document text
    • https://korankertas.com/contents/files/galozugupivizakafobaden.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7g445mia0au7814eafr8fs3mv0/ramapoxomuladobos.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/97723589124.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/27951405695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ygopro+apk+androidPDF 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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 20304 bytes
SHA-256: ca73a579400d71c091adb9f87c26b193cdcf751b5ed9a0fd3e2b67d30d491e73
font_02_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 10200 bytes
SHA-256: e6621065720b5801f355483c2780cd05d2ae0a66030849681670dd7cff647174

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