Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd560727d2fd0c1c…

MALICIOUS

PDF

96.9 KB Created: 2021-07-04 00:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe94ee2353d2abc8e9c153eea3743386 SHA-1: dc9596be93d676d9b09a6dde1872bd817dddaed6 SHA-256: bd560727d2fd0c1cbb1cfcc72af9325ecfd3a7cca3061c4c735e2002c9a3d078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/146f9634b66b991464e3c2860744a806/vajenevemudazibiv.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f572b803---bofikomofonanovi.pdf
    • http://zatexpress.com//upload/userfiles/files/69163767146.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/18afcf29f092cfb44115a784fa3bb11f/26133620688.pdf
    • https://fzclicks.com/demo/files/editor/file/vowofini.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/25e636f9dca5855368be0fcd69ef2c84/21613335874.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25a30c000---xusowuzufeger.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0a9d2d44007792e6ee99c657ccdccab5/12238468020.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087514882c8f---27369682900.pdf
    • http://montgomery71.com/clients/34132/File/66421008902.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc0446d04---wabebobofu.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/kowoxuvowe.pdf
    • http://ttlh.vn/storage/ckfinder/files/80520294442.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e055e460ec1f41613db1db99debaaaca/gufamuzesasudozikosi.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/13n580gbqduo02gjril24drjo5/94918512304.pdf
    • http://ghalemdi.com/userfiles/file/41614897161.pdf
    • http://abwlanham.com/uploads/files/79621320739.pdf
    • http://gelikonline.ru/content/Files/jofivorifisojoxavu.pdf
    • http://naplesredeals.com/userfiles/files/lisegurupo.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8a57a462852mc789rigpikqg93/39594281911.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512164407684453.pdf
    • http://adamlegal.com/userfiles/file/27204013803.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grimes+and+musk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ec.bin
8100b89af0975f40a56aa94d197e7d5aea26958943340c6bfaa0460a5c20c810
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 10376 bytes
font_01_sfnt_off00011852.bin
55a070199a9524cbf65eb43cf1395a250b87ac63773a673e1adf5cac1f241e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 18424 bytes
font_02_sfnt_off000148c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 16792 bytes
font_03_sfnt_off000160d7.bin
c9d310e3f05ceb503418a5299038822c3e71cafa139d12e33d730308607643be
pdf-font-stream PDF embedded font (sfnt) at offset 0x160D7 16220 bytes