Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b476a3216ceaa…

MALICIOUS

PDF

86.0 KB Created: 2021-06-22 09:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e92636bf2a4e966cfad634a66dd715af SHA-1: 144617e8e044f7139f8701edf1763c8a251c1dc2 SHA-256: c27b476a3216ceaa470482ea691f03c24d70f441c301929396dc8c35cfad1b91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=blessed+the+lord+oh+my+soul+chords PDF link annotation
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ff391e7c0a32ed06492448ad06f6143/xuwurekaxufenoze.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f5f5103979a013810f0f71f22037ef57/78646568561.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/gonumijevovuvex.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/p2bsj70edkhb8sihjf4uegh076/4912831639.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/savulivalakewureviwer.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e7eb3f16---75155320034.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/57646894348.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef19bb0731---95278061669.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/8849612211.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/khq4h0p7stf22oqtfp3pmi19c3/kidalabazanamomuvagofop.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/5253341920.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd1de27de---29251320554.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36842546---64887607560.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/70bd8c11d0c532648279fb9eb050c4b3/43475345558.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/3549575943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2554eb664d0f1697e3a1161f056315f8/luzarovijifotulaxememixom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 4848 bytes
SHA-256: 8c4d8176aa92a2297c1501069928730e3465c61cc94d39efb0b0edbf3e1bb0c9
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 13248 bytes
SHA-256: 74a9f7aef212cd1234bea70d6630e9167eeac513d2a41fc1a69296d218d86af0
font_02_sfnt_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361