Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4540654373a8af…

MALICIOUS

PDF

106.9 KB Created: 2021-07-22 14:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09ac7e618feca17fa3a14c40c141e9c7 SHA-1: afe490b27c0bcdadc88bc7712f8044774d55eb77 SHA-256: fd4540654373a8aff5f31b8fe39656046b1a6478815aed49c35fe9f1ecbe7571
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gvgjq83rvnc05gneqtdd1si0he/mozezogugijumerawojukeb.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf136b774ba---45006648803.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83e8b6252c3163e6b57c89e011ab66c2/25630416458.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/niralov.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210616_EF35CE9BBE236D09.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1n0hkoog8lfsov7t7u6orqcvi4/17240687743.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4ffac1bca4842488c30bdc57209727e9/xumepomuwugu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/i17i50iq1da3imvmj24349sn9i/51797773617.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de35650252c---zelofokotumekobixezixal.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/54489720738.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/89c16e9e01b3f46c01e85ad73304c4a0/85114427149.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lk98eab1q5hma377h4patjqcm5/mikoguvonivaxotaraz.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nawifevotujesuxoseman.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6deb27599cb6628cf1c68026de93c617/moxot.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/mudoja.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/52c6b0e0a5725db25ceaebb2e867bd69/wegenuwamozojuwe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6b7v4q5hf68vkergd3mabe20q5/15443204180.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/resonuxef.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/64976784725.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/vivuvilewagewefisuzis.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/gowebuba.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/98904975932.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/zafupupiranedudufone.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/96571542572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=god+our+protector+in+hebrewPDF 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_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 16876 bytes
SHA-256: 91f24773c6786ea6e88e8a537b1311797d42eea3a4e2961143c8bbd8ddc312c9
font_01_sfnt_off00016b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18321 10600 bytes
SHA-256: e0031b6af680c549ac9547452e9b0dc3a0c71114ce910ebfa081a1354e8d024f