Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0425dc42d0dc2c…

MALICIOUS

PDF

89.3 KB Created: 2021-07-12 22:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5098332cf2af2f3dab3a3f5f038fbda SHA-1: 2ac3d5637c665c58b1cc268dea2b2004571faade SHA-256: 5a0425dc42d0dc2c5e90d99e45b335090064f4f017e8c2ab91016a4ab82295ed
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 content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd36d4c8aa---92285961986.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5170f9c1c5---duratezirapijemedokawa.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/15b4a989bfd4823049e677c24c221cb3/sagezatibokedofomepo.pdf
    • http://deurenhanger.nl/userfiles/file/1634032628.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/20049354553.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ocankciocv6ng0fvhbv6248hm0/kisedus.pdf
    • https://travelworld.ro/userfiles/file/jepufelatuteta.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609819bfee85a---71951773219.pdf
    • http://geredekombiservisi.com/userfiles/file/nilusexedamuxeruxegolan.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1ca068b39fa57183f99523c104a6d42/70054118195.pdf
    • http://adacu.org/userfiles/file/20210622191015.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3c45158ea2c4ad26cf176778ef9a027/24617422381.pdf
    • http://wagnerpc.com/userfiles/files/dalisubaxiw.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/96750912106.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205dd65f8d---fufuzolijekurujutel.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l5cki3kd262337577ngb619df4/nilabu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e9c89902d---93106185179.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750bec93403---joxoduzafi.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cgq6cjs9ucabm5qrbli521ivf7/mejofeduvobiniseteli.pdf
    • http://china-engine.net/ckfinder/userfiles/files/92663463325.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c8a2eadead7e69f0ee5f92d6dd7fa2b7/63145488059.pdf
    • https://fanaf.com/article_ressources/file/59107777846.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=viruses+you+can+get+twice
    • 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_off0000fc3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 16792 bytes
font_01_sfnt_off00011452.bin
ac4004fe711bb6a1d4783a33e8c2859f7bf1ab6f92fcbc709342299bdd5bb751
pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 10628 bytes
font_02_sfnt_off00012ce8.bin
00aee29a797dccab9211f5b06400831db0a35a823af77c9483f13c3bd60fa1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 16704 bytes