Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b7d70bdc4b31f5…

MALICIOUS

PDF

69.6 KB Created: 2021-04-28 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 28e0251639d8651091a8637b4c1e4a84 SHA-1: 75a746b553dd496fec6ed1c81bce4241b22f092b SHA-256: 09b7d70bdc4b31f5660731172db8c10dabdc4d906958b15f1a5e56b24faf7953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, likely serving as a link farm to distribute other malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dc1acc69---solok.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3557b22b1a96981a397c8ce23d103b47/47883870866.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kc6r351kk6mqv22q2jp9cu5nm9/94036747976.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc08aabf4f33a23a49da8a501bc8f11/buxufikusipalulowomoju.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4ae807f7---guzadaragoxilosegefutexi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607986700e26e---fasizebonesojupuge.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d0828d870437ea7b44ae5a6c5ff157da/dutefubagofobugamizaximo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d00ba29f8dce8e4207d3ef88dc7f6202/54821407247.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ledq15h1eerr67ncptbntrq6h/61683030379.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b0e2c9bf---gotunenasikabagal.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0abb5337a---36157260711.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7481508f---69096549383.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6oj579mber5ihctm268s4mrtep/rebisibegoruxegidovap.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088804896cba---83824702825.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4835eb899---girusazisomonet.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/S30rS-6n6vg/uplcv?utm_term=bubble+shooter++for+windows+10PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5260 bytes
SHA-256: 67ebf8875d828d7f9343dd5cd15827382fb94e8a7177117f3429d6fa5bdfecda
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 9812 bytes
SHA-256: a65515fc385725dcc11a42a6d7e55e996fd08e0dffc9ea73ab02d83a9a85f828