Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de4de6dc14a3bf3…

MALICIOUS

PDF

72.6 KB Created: 2021-05-06 12:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72561903e23ae95f43dc71be1b8b8b8 SHA-1: 7cbdbbf24d2e7e07713c78cf11f9a1c41e7a0459 SHA-256: 4de4de6dc14a3bf3bc67d58caf164e7fd6a60468f67e8f3089aead875627cb82
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082a82355031---kivitukokurevumivileben.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d6c197d3036917bab3e38b1255bab21e/3468989532.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3d351aa2---xetewosevijaruxemamavopuw.pdf
    • https://allcreaturesinc.com/files/files/xikewimipogijag.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9858h7j5vuf680ngqr73muc9cg/dabolisawumozibiritakib.pdf
    • http://kompletucetnictvi.cz/files/file/rigevugabek.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3e6dbd59---78805025500.pdf
    • http://kapelski.pl/userfiles/file/23252949493.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dafea2d06---xuvokilavegami.pdf
    • http://alliusie.com/userfiles/file/64885617802.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/18eaacee3f6b950866c1dc18f015353a/47994476036.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077feddcf278---8311613402.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab664b335---bivakemovose.pdf
    • http://www.aadhar-interior.com/userfiles/file/52336125538.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/p3qr4riht4qn816t7063b6r1kv/tikekeve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=diamante+poem+templates
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ba6a6b6f995420f0842271849813e1c/kumujetuzotidefuxadeselen.pdf
    • http://www.readwritethink.org/classroom-resources/printouts/diamante-poem-30194.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03b.bin
f293209c5f850ef65f6de8c9d38b7af2638da82c295eb3888dd70ecf8c9f1af1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 4868 bytes
font_01_sfnt_off0000f0bb.bin
550171fb33636c73d5a0fc1cef9df9d6cb5baf4ec54bbd2f5dd877ce33aaad6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10884 bytes