Malicious PDF — malware analysis report

Static analysis result for SHA-256 a355595867e35c4e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 01:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5df9bb5b1a9a394e81f7c6af54715a2 SHA-1: f5491a36c2097173dc65a6ba51124b70d2a9fbf9 SHA-256: a355595867e35c4ea895a27d53edc52ab1f34f179f8326ffd4ee33e37445976f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics identified it as a link farm, with many URLs pointing to PDFs hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://trufeel.com/ckeditor/ckfinder/uploadfile/files/nexobaratiwenuwesaw.pdf In PDF document text
    • http://carszana.com/image/upload/File/fabuja.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/55298793463.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/neragujo.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/8059451350.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/599a9decn91cir8c2478l1tl3e/80076675193.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/sopepab.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/worofarujomaroniwoleb.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ed95d1bff---12460355232.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021926957114551.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gugezawo.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/95141703050.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/pifawedeziruninujinowu.pdfIn PDF document text
    • http://cloverdiamond.com/file/rodowuveniji.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/68430256694.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/teletix.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/12167906238.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/munulodikedus.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370abb51d82---gopigagido.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/29327707026.pdfIn PDF document text
    • http://kelvista.lt/images/files/kubobazumesotuji.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161430ae1448ce---20964928726.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/79587202427.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/56352613081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+increase+storage+on+my+android+phonePDF 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://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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 11104 bytes
SHA-256: 01ee474d9ca3594b675e36662d73b98242ab4af0cee046abe9c84fe5901352f5
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 14564 bytes
SHA-256: 90f47da4057b43e4ea49a562ca5fb6f523eee5329d8235514cc240e0d8043a22

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