Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae7aca1c9a6dce…

MALICIOUS

PDF

74.1 KB Created: 2021-06-24 18:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 67ed55d6ae0bee93989d5c619a9f71bf SHA-1: 9fbf286c3eadf0e1c3ad7922e5e627c528e37227 SHA-256: c5ae7aca1c9a6dcea05411d09029c4e13d28ddb2a3e9d43db58abc2d9f87aa26
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a browser extension installation lure. The document contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious download pages. While no scripts were directly extracted, the nature of the lure and the presence of external links strongly suggest a payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://suachuaspa.com/upload/images-content/files/6671014925.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4a995dd7ea85cd745e8330f8fda82c22/jumubetamovuva.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/15755794178.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cnf2gucp019ghdevepvlbg0cv2/63998942976.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/befunobadolamubatilix.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7475450e9c---pefip.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095466c9c9b2---dowomenajikujemum.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f0690ada---mogiwiwewozugisedofeduwep.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1fe3ecd865e118e3fc7080d18bc278ff/kefekurizaf.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1facc323---vivugixuvozepopotomole.pdfPDF link annotation
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/edd250333f7d52b0d998d18e3565098a/6093856669.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7511e902fd---85199800455.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/u9030acv42kqts6umb8sg2dip1/zovapogageneviviv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apne+tv+bollywood+moviesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/617ba5688ba888945c9baac4e682c6bc/84546053858.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 5180 bytes
SHA-256: 03db0ff8620de82b745c11aec3608abb4af93e1677d519c2f6cefe7d25f60b83
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 11144 bytes
SHA-256: 098aca78025b83269c71cc91e393706750a3d3d73b28ef3c16d79c5d06cda4c2

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