Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6c64a4b5f7d05b…

MALICIOUS

PDF

94.7 KB Created: 2021-07-19 04:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed499a7c73919f7dc3ba3dd22750cb43 SHA-1: eaf3fd3601f5e2eaf69dce7d32163c9cf3ada7bf SHA-256: cc6c64a4b5f7d05b55960121a2b5b2d1a0ef4751eddc6799e711ca3c3ee3b97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these compromised sites. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a008b12065a---jolodotavijevi.pdf
    • https://soudurelauziere.com/upload/editor/file/90956904182.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f4a21377---zelavotolofavomalumifil.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84446e043---bugovaregima.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/80s0fhe71bvilbq4luklbeusv0/jomovomuwerafevu.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/64735663528.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe0879b5---zexafunomewobosogax.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/77d58cb4b92ab9d5669bea03768ba8bf/81410548653.pdf
    • http://skncn.com/u/files/48459018872.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b214c4cee45---tabapetit.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608a6196ddbc1---zikoramo.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e28cdbe82c8---ratatijisosefotozarobam.pdf
    • http://naplesredeals.com/userfiles/files/nuxas.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750abe87395---bekikunukevowifex.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c13b407e---ropemeku.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/87c674d8036291195d39d2d420e38459/deguwomixogupel.pdf
    • http://aifamilyreunion.com/clients/59202/File/32828256280.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8440994f03---xapewunulakowavanal.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/96690541434.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukelezefo.pdf
    • https://stmarys-perthamboy.com/upload/File/nipip.pdf
    • http://alibabashipping.com/userfiles/file/raxoditemerevobizoga.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45935453ad---sarixibesubedodotumomemap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+formula+for+electric+flux
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16792 bytes
font_01_sfnt_off00012380.bin
3c44b6780f30d101777be193052672ff77046855f1a22c39f16f689816e0c61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10692 bytes
font_02_sfnt_off00013c13.bin
83416364b30c4beccef45ec4c170f49ac4b64ae0b0acb12cde307996ac326231
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C13 18584 bytes