Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2681c14cc641791…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 06:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 776535392b5db1c3209991e2964bd4ef SHA-1: cbb8a9731681ad66935601d3c2b45477cdd38c44 SHA-256: b2681c14cc64179176215969fde7ab4b23c87e52a005cfb4bb89e63b0a7ddfb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=bhagavad+gita+in+kannada+pdf
    • http://krevue.cz/UserFiles/File/losorebuviwiderepule.pdf
    • http://miyozenemeryville.com/uploads/files/99305336782.pdf
    • https://5ky13lu3-1251.com/contents/files/nagafase.pdf
    • https://dom4m.de/userfiles/files/tunawurivodon.pdf
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/89317173663.pdf
    • https://ego-sofa.tw/uploads/files/202109281603168710.pdf
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/69388876516.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/11b3cdaa37e832660da2b6705baef806/ropofudukige.pdf
    • http://furniture83.com/upload/files/52116371355.pdf
    • http://poorclarescork.ie/images/82010057625.pdf
    • http://ecoaga.com/documentos/file/38659233645.pdf
    • http://confidenzacsapagy.hu/upload/24503928503.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c636764d5---kefuwikutijiraxejaxim.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/qj3bgrjdh8sa9qv5kdfbjc7ud5/tutagotadoranavezunol.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/72852544382.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/mukefopevefobuze.pdf
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wanopokuv.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_off0000b82f.bin
c76400a311758134d9e81f15a3fbd62800a9b979e9e035858b7cc031f2224327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 10424 bytes
font_01_sfnt_off0000cf8f.bin
4f8b50112e31914f3a0025217b09276cf3054a3d762894458a4c5747aa8c8d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 19408 bytes
font_02_sfnt_off00010232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes

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