Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91cb0152eb50ef3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 03:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e6b06b4dd3d603650d26767d550ab41 SHA-1: e0c863e914aa08a240612d1a510ceff2c6853808 SHA-256: f91cb0152eb50ef3d4b9c85c60e57767db6ebb4c2ec79ba1f82d01bad059d840
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f63ac0538---86359888549.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0ac72dc04efa4718b88ca1d8f27a58fa/tutipotegosizope.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tva9m19dot2k9ev1ne0gtm4kre/46037155407.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/livaxuzizemelakabilerig.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tokepudanowizerenugodizen.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcec65571f---vefumetigam.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/80347118959.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/62f5v50fsoia2ap3pt0jpn55n0/7798805190.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/40331862724.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/725e8e8b41b9b15d079bdaee4955ea35/lotojexusikegojomun.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/093d8p34c3nbbb42t1jm6v2mr0/rujadigegunipise.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/68024317280.pdfIn PDF document text
    • http://mebco.ru/images/file/zixep.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/40225976363.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/judofitutowixefidemexup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccf031a21---fokukam.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/14318370553.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/27683046072.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/jolex.pdfIn PDF document text
    • http://homeopathyhk.com/files/15678732554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chart+of+accounts+structure+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 16660 bytes
SHA-256: 132bded8bdf8d85e8595880be2d73e725d1378f6864399fbefc15e662f757d5e
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10712 bytes
SHA-256: 503f00bb605aa7150a9055694b108add101aa8b22b1fc88049358eb770f0c0ec

Open this report in the interactive analyzer, or submit your own file for analysis.