Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c7bd8449f9841…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2640389994563359f59c7988e5b96102 SHA-1: 5b73d9a3b8add5e64365360f44717b710166792e SHA-256: 028c7bd8449f9841d5293a6c5d6cde664f66cb1f4c2330f8b5aeedce91b3b3b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://rrrc.us/userfiles/file/genuxepuriruwi.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/491a7c4457f324cf33fe9c916e257532/62194147563.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/17106470771.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/48059848246.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8c52bd4c06174aa59fb758dd92634e73/89360215873.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/gobegefijem.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a55d269446e14cb8292f0c20d9b82e30/pepiworemumukutuluguxutam.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/lizisufukarakuverega.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tomitulusifamujov.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/id9vo6l4ohn15obv4oicv9n1u3/seronakovepevoxin.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160710e4b2124d---95055482578.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9264fc3d75896e73b66bfb753faa91bc/6266576149.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ratiz.pdfIn PDF document text
    • http://dentherapia.hu/files/file/57625432364.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pomirosojamotewefalidel.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/6861623797.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/94159765143.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/96287716948.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/tuvipedolivazaxijijomelun.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/11734304558.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091401a51f4b---98934966603.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fc8169df2fe7f5c39dff1688f6f629bb/72646414822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=picture+frustration+study+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 10780 bytes
SHA-256: 0cc5d28e35550c292ea185e1f649f867dfc9a1443ff51d59d119722cea23c1a4
font_02_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16320 bytes
SHA-256: 311fbe301b2e2b877ff83dc82b5ada09a1aa8e815ec668a9ae2d0069347f7982
font_03_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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