Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7f6f1a34c64ab2…

MALICIOUS

PDF

83.6 KB Created: 2021-07-09 09:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cacfc0f49caace7103331704794e355c SHA-1: 83e07dd683104dcdb2ce207cce6288b6cc60b8d9 SHA-256: 9f7f6f1a34c64ab23d62521d14f54f5c0237e7dadb7d94bb735dfaec71a61c0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=234c+of+income+tax+act
    • http://tuanayapim.com/rsm/files/pemivogix.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7j9qjv8fb8k7s1u8inbfo22l2t/67472605158.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518102855274018.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755170a7819---28591218941.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/s5eh2eetk7fdrr9n5v7dhuajbj/letazipunexezimebujemuf.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/002883da9101de3c1ace829d8fa723f8/88136209491.pdf
    • http://vivo-mebel.ru/upload/file/14965951461.pdf
    • http://gat-asset.com/CKEdit/upload/files/56580203525.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a0af17cf4fa8496ca68eea56c4a277b4/vapilagep.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd99279abb---mijevexapezosaligibul.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/juelsn1rvsmqmtukv9ma7etle6/62272179240.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d6d46447---46202690984.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f91f517cd---galujumolazunogefopa.pdf
    • http://etcad.net/np/upfile/file/87347904944.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c04b8caf---82872111171.pdf
    • https://pharma-tools.eu/galeria/file/97257799315.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160887d10d8d71---kegekogipojugatigotos.pdf
    • http://cnmrobotics.com/files/files/46157297277.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ada9ad3d---54020031152.pdf
    • http://samuiluxurytravel.com/Uploads/file/56557047297.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97b13ec1d94247b488596a65a917d7ca/limutaxawo.pdf
    • http://clingac.com/d/files/86474482275.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836eb22161---buruxuz.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_off0000e4e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16792 bytes
font_01_sfnt_off0000fcfa.bin
b338575f0163c98a9e39836cc27f47722d823873941feb99d27368659cde4c38
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 17296 bytes
font_02_sfnt_off000129f5.bin
d79d37721956c4953f4c2cc5548618b5e9d1ffa750ea1a1c5c0d518933c3b012
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 10556 bytes