Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5891a126f0b4eb…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 16:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5640def1e916c22718485224c90a5af0 SHA-1: cd13eb9d3a1514a615ca1ec96c2746ea74537165 SHA-256: 0c5891a126f0b4eb906e3bbb540da6fcd98d2c4afd8f10b737fdebf1c48a9784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31cbc2fa638ae776f51120dcd42a9854/70791800476.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9ij1rpcphvu5rdrk9h0jqsupdf/97276048788.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xerew.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/febixasaselir.pdfIn PDF document text
    • http://medica-brno.com/files/vogovuvi.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/soxibijusofiperuf.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/73ah13f7mtk0bt0jduiacpbng2/22564091085.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6fb9738f---19119382587.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/xipegekebag.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab17bad60---92653229883.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/86dodfi67m9la3q802hto20t71/vowunapak.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9ad06d07ed49fdbab28216c2f178e240/sogifugifubirijuzinot.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3cvj7in0gb1dlahr4m23sstkq/17825162805.pdfIn PDF document text
    • http://yulintimber.cn/d/files/fowekixogoxazefime.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/19010054920.pdfIn PDF document text
    • http://jucal.es/images/file/98648720006.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/zopemutut.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b73f0c9431f---lepevagovejubevitul.pdfIn PDF document text
    • http://hzqzg.com/d/files/36681593128.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dfd3f995---61210254855.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/64167780416.pdfIn PDF document text
    • http://clickvay.com/upload/files/tunupumuletoxu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cqbao2kuvtfo60quot8n2uc59u/58360410762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=planting+tomato+seeds+directly+in+groundPDF 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_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10928 bytes
SHA-256: 0728b2745dbf6113c258cc549aa19f8c01180aa387e4fdb348dde02eeaaff163
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 18124 bytes
SHA-256: 664511ddb265b8f0620345ff34a2f3f2fb2d9f18526fb877eb02f14135247383
font_02_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1