Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b2a6177e1204c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-28 15:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8badc76e374c524b7fda17cd21eeba65 SHA-1: 324bd8fa33e9b273c8d6476e337d88b704963053 SHA-256: a05b2a6177e1204c897f798ce8d46ffe38cb7748776643ffc3415e9831c23899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=fifty+shades+of+freed+full+movie
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/672da224543da25633da1a59507107eb/25197118718.pdf
    • http://dzbnf.com/upload/file///vegulegikejowasuluwasit.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ef3dcf9e105e0bd2d0f53f8f1e05990c/45274191590.pdf
    • http://fiumaradelsossio.it/userfiles/files/37453697945.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e343ee07---89406023227.pdf
    • http://fouladsazanco.com/Upload/file/7023096836.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1f21507af6ae2811df0cfe588095f007/dunamujo.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/14511e036b529b4b62cf891544cfda4e/2354714843.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/14av1d31rvgmqa5d17jt2non22/masaxok.pdf
    • http://clubesquilacoma.com/uploads/files/49372641879.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa15a079e---80279330119.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4591ac2a573da9fcd1f5c20ae8bc7b6/dovojavajikolojupujopaja.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b4889daf5ab---zugiv.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf3eb7e5f---nagewarujisovinuki.pdf
    • http://alanurturizm.com/rsm/files/11941827489.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/jutifam.pdf
    • https://actorconseil.com/files/file/xesuxolenisikeju.pdf
    • http://18554080.com/userfiles/file/47447418252.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935db96de---genoxupuwus.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ce2982f0---37178026677.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c4dfd0d38170d1c282cb111c5d8d1ea2/nowesogor.pdf
    • http://coreaad.com/DreamDataUpload/file/71258703073.pdf
    • 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_off0000c174.bin
935d96befde0e3a45598d073a086c70be45e6c07d2043f3210d37b274462a121
pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 10772 bytes
font_01_sfnt_off0000da45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
font_02_sfnt_off0000f257.bin
e900b08f771b2254733d864e119fa284f94115a4f69455f98618ffcb8d1f6dea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16416 bytes