Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3193bbbacc2363…

MALICIOUS

PDF

86.7 KB Created: 2021-06-09 23:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c18610887ad6af780a1640f386ba5c22 SHA-1: 5a6e1e1c9b62de82d9c9bc241b334d55522f5a3a SHA-256: 1d3193bbbacc2363847422da0fcd040fe88f8028ade0aae08f8757762cf582a9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=no+one+like+you+frank+edwards PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b05774f187e---wukuvogudovuvabujaten.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/teruror.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5c082a3210d15d805c3dfe5611c9bad0/99250653132.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/inuwagaterinunub.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/supivimagi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/pasom.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/23298044269.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/birezenasipat.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a54afc114f4---34030835858.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/98514886467.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/litijoxevuxalad.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2di2rsigef30ra1cposfbl6f56/47701611465.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/davivet.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/310fbb18867f1b6e69e4503f43db49d5/sumesokakubi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/oeh0a41uljfbi1rp6an36sj3qt/6293303753.pdfIn PDF document text
    • http://jucal.es/images/file/23785936423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 5128 bytes
SHA-256: fbab5ba144b00b6efb30111d8bd8af7484795f41b020cbdfeb68c17f8664483f
font_01_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 12964 bytes
SHA-256: 74605194d7dbefa3af25325cdc3da8d1b0e67aed1841684b45808cd098418095

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