Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58deee0083388db…

MALICIOUS

PDF

99.4 KB Created: 2021-07-02 21:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c345ae7d919bce700d5023748564baeb SHA-1: 2d2af86c6f448e7842299ca74bca5a38769fdb12 SHA-256: b58deee0083388db7079b2e239ebb0bf5bd0326d4c4ea0a1957f81d3f5736116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://unternehmensberatung-hegenbarth.de/userfiles/file/bovadufajobiroferup.pdf
    • https://ewt.cz/res/file/97924077368.pdf
    • http://fine-cottage.ru/userfiles/files/gexovuzalaratetusevul.pdf
    • http://bacvietexpress.com/upload/userfiles/files/16277734652.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/514ce260e53d3fa20836b36a843c130a/13161703560.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9802f0c7a---17555591217.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986a6c6709a---57119231389.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d26b51dac28ef56ef0e8083761c6a568/80476105324.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160968a15a4804---fapokopabevav.pdf
    • http://good163.cn/Uploadfiles/files/lakus.pdf
    • http://celcg.pl/uploaded/file/28454563829.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdf
    • https://benqmusicworkshop.com/fupload/file/nedala.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3606dee0---tipadexixorolafe.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1d8548d8a954cd6cde288079301e5835/19604990163.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc1c7a06cdc3375ca325b77b96b93e/zurozegixiriwokigizesota.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160881d2e641e0---jizexedotafenelekuf.pdf
    • https://solener.info/ckfinder/userfiles/files/25033431130.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f21f7a9fe29a0710178cbf192d333c26/40935542353.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bfee6ee6be6ac65334f6d4da6cc92f6a/43000912227.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sf75j0rg5uqancav2ea9cr9s30/62394019570.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b449c6a0825474fed2d9669cea0dbcc1/sewasufesevo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=biology+the+dynamics+of+life+crossword+puzzle+answers+key+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_off00011fa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
font_01_sfnt_off000137b5.bin
9991c9a8ac7b4eb4d3b3626efcf6504dfa10d94365a8494a614a5ea22f3b141e
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 17152 bytes
font_02_sfnt_off00016493.bin
cf7345b9f75210945940cb33beb02b9080ad820d347629b21f3c33d7091d80ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x16493 11572 bytes