Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9586b9ad9a8ae2…

MALICIOUS

PDF

84.4 KB Created: 2021-08-03 19:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5746d8e125bd61111886c0aa83398e01 SHA-1: b0dbb6b3271def5073dc1cf7f10471df4c576446 SHA-256: 5b9586b9ad9a8ae20164d749f9d254db96bb24df35ef044dab73372ed458d077
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. These redirects are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=pst+jst+jobs+in+sindh+2021+how+to+apply
    • https://daxitrip.com/basefile/daxitripcom/files/rinarofufitegikabem.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5431f26b03a2cc131516845db3f78f41/44200398416.pdf
    • https://all-new-wow.com/upload/files/55207339670.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b347073393c---tujaxi.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ece85974---navazigefawimefo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/st88o6pavhrdo32qo140jndphr/kogixivu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ojk8jlj7hbrb7ej0c9hvgaqkhf/ziwajafiked.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2284b330---sunokugozoraxurobubijuleg.pdf
    • https://aplusadvance.com/naver_editor/data/file/21345855747.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/38b4ee5092414294b7e001aadbce4663/81179975299.pdf
    • https://yarpaket.ru/userfiles/file/jiximotudibafexizerazeril.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102f43188822---zemimomeviv.pdf
    • http://voxel-avocats.fr/uploads/file/pesulu.pdf
    • http://eltprof.ru/userfiles/file/29712442905.pdf
    • http://uci.ir/userfiles/file/vavivevexo.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d0c10022---63638376097.pdf
    • https://yellowstonewildlife.com/18936909365.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca1540b6d---45538352872.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6025288f12---vapaxagilub.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8214dc9b4---rinikenafuzadekaxono.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/60758893412.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_off0000e539.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16792 bytes
font_01_sfnt_off0000fd50.bin
d924b6ff4bda1a32f6d9186f423f1877a13d6a87673b344aed2c1d79b5c49d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11024 bytes
font_02_sfnt_off000116be.bin
f2a9b8e6db91193322064a23ccb0e05924704ebda6ae100adf68fc112f66d448
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 17432 bytes