Malicious PDF — malware analysis report

Static analysis result for SHA-256 835a009929488291…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 16:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eed9ecab928395cd03be303314f7a81 SHA-1: 14c32872b1547eab9dc9a12bd33467bebdebd646 SHA-256: 835a009929488291ad2825903b5a94062300cced295ca3d419a9c72d9e03828c
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 ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users. The primary attack pattern involves luring users through a malicious attachment, potentially leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thehideawayresortpattaya.com/userfiles/files/vijuze.pdf In PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210731215559.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210725104120_20831052.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/35510273332.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/pejuxusenavatudo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cbd26da09b879bfcdc4ddb510ad79943/noxirofug.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/gagafaziwarunigijurigapul.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jpoer90h1plmksahgvpim970j1/33793546072.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/77926325904.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zigaxodudelugimadano.pdfIn PDF document text
    • https://ville-rouillac.fr/docs/file/sipuxetilo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/38961024222.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/50447587145.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/begltl60en73e4289of4mucq1l/zirodusokamubufe.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84a57ee4e---5601630846.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/98168303671.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/29774193343.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae294d292b6---mujoxaz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39839811569.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jefen.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/35179660974.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e8a51263---16586572943.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/acc72408299f51d713c80101d7768c1a/tojexapowepegame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unit+1+uniform+motion+worksheet+2PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7d329b6a1ddb71fdece310b52bf0d0dc/60885302378.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f22c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF22C 17868 bytes
SHA-256: 4c4c9973f8c5dd1302fe9de5c61c5c3aecc8c399620e9b96e25ffae6f14df8a5
font_00_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 10728 bytes
SHA-256: 64ab06b5455eb9feba1f1e75d60ba0c0bf4c76d79295d2d74a439e8900af1781
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 17512 bytes
SHA-256: f773e700fadcbfe7336fd53cb6494700f4cc5c11223c3b87faf810b32c939e19

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