Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0132019db871e9…

MALICIOUS

PDF

94.4 KB Created: 2021-07-09 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 029c8f484fa9a355c2d33eaeda5e6559 SHA-1: 1754a4511339c6797ae19351cae499996c5e4c2c SHA-256: dc0132019db871e92c9fd8464278a5d5cc422816e726d355b6c834fc3c8020bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ca83c58dc07d7eea29b7fe3c8861b520/60531453811.pdf
    • http://ahlhy.com/uploads/file/271458257077.pdf
    • https://daaeportrett.no/upload/file/48152082070.pdf
    • http://goodwill.pl/userfiles/file/78290331447.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/vexaperipa.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf6bfc1429---dutigawirekunakofaka.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2fd793fb---77079169058.pdf
    • http://interreg-ipa-husrb.com/downloads/wipenozasa.pdf
    • https://alutat.com/data/file/xedogufonadajupaba.pdf
    • http://rhodeislandalpha.com/clients/56223/File/60309447868.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8b92e786---gipunipirigavasutixol.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5bb16ea7---68532138269.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa64fccc18---39967871869.pdf
    • http://fzsvybbs.at/userfiles/file/pigebuvalusadotiwamu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d99999467---27925772584.pdf
    • https://angkortaxiservice.com/userfiles/file/banetaxogu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f070c588fd---83717483828.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/j98k5c08jog07qu03qifumq48e/417546049.pdf
    • http://splogservice.ru/content/file/57154794858.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/egclnsrjcbbkt7cpmp9l7j8mn7/lopabafefu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814eed9360---kalibagiretesaxonitukupis.pdf
    • http://adabaskimerkezi.com/upload/file/19023877239.pdf
    • https://bd-sokolovska.eu/userfiles/file/4568363267.pdf
    • https://mangonebike.com/uploads/file/supilelutipavav.pdf
    • http://sun-tes.ru/files/file/navasa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+a+700r4+transmission+automatic+or+manual
    • 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_off00010cb9.bin
beddf671637ee47c9b92e1b2d5169c1c18d77b57ced27b12a3159bc37d5a2cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 10560 bytes
font_01_sfnt_off000124e4.bin
895a88b97461338552552619fbfaab94a76db0893e8092fc7d88dcd52c40e82d
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 17840 bytes
font_02_sfnt_off000153cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153CD 16792 bytes