Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf29ad4b78d13d3…

MALICIOUS

PDF

151.3 KB Created: 2021-06-20 00:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6346c807d2265bfc46b180f3b177e8f4 SHA-1: c96338b2bbc41f098d4cf79b4492a3f2331a8c14 SHA-256: ebf29ad4b78d13d366107b8d3e7564f5f8a704f7e539ac735b96ab97217134b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the links likely serving as a lure or a distribution point for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jb6kc4i3shq02olsqj2vaifbd5/dawabibilub.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2118232d10---xixox.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/68ca6lc2loe7h2bmqgj5hlovfo/93556910036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797eb23aaa9---lafalefar.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/j1nsl4mvg4af9l7ufqp9nthihm/32294064237.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0p06n72u126q4dl055bubmqpt6/watilituguforiwixu.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/32365820826.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/muwuwivena.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/v5fs6mqei0iq8f8m93cjg2390h/5586309648.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7461b024a---jogugamasezetukoxeforaf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8ff33b32---seriwuvifarusubopalubevag.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd9017a02---dejigixizubinazatuditonop.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://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=japanese+grammar+appsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 77040 bytes
SHA-256: e7fe352909126787eee1403746a8c9bb9fbee4ecc38a45788741f94f83be3331
font_01_sfnt_off00020cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CCE 4644 bytes
SHA-256: aa4027e0989f2979466f5e5c42e74c517e72ddc8030eb60a69f4152e42547983
font_02_sfnt_off00021c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C5E 11108 bytes
SHA-256: 7cac05e68fb5643ff700afaa02413c3418379b0ce84c778a98116cf41f315880
font_03_sfnt_off00024256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24256 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378