Malicious PDF — malware analysis report

Static analysis result for SHA-256 addfc1f19edafd1e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 17:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: df887e307f37bc3b7f3434f3163a5a83 SHA-1: b2910de883b5c518989f3e82ab8b6cdf8757cbfe SHA-256: addfc1f19edafd1e0a385abd4cff83d044c4d2b557b1dc6a2310b7516f2c4252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=unturned+gold+bar+id PDF link annotation
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/wejugipikikibeze.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/24059558472.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/458a03d2a88783f56eb802edf3b5dd80/gejedudomiwarulunosoj.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/94590798681.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pebujivapepifopidojeju.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/nupinalojomiborotoj.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e489046---26908438911.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/wuwowadezox.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/54727606036.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/kafidevigumik.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/bisidiwogozo.pdfIn PDF document text
    • http://3asoft.vn/img/files/lumosifuwisomi.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/25274024452.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/47321847307.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fijofagidonipegesewopod.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/7373457474.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gezeveguxixazade.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/fegojekexe.pdfIn PDF document text
    • http://boldogelet.hu/media/noratebalu.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/50511796065.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613894a8b4f60---rasosutulu.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://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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 18028 bytes
SHA-256: f7852e212fc2d0fd8a37ce60717ff4a81089c8f0ed99ba5738b8a61d7947da58
font_01_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10500 bytes
SHA-256: ed64a7656d44f7ecacbdeab0f94132b88750273422f9d4b99b80cf83de4f94c4
font_02_sfnt_off00013bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1