Malicious PDF — malware analysis report

Static analysis result for SHA-256 a011aa3195306f57…

MALICIOUS

PDF

87.2 KB Created: 2021-08-05 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 261427fd11976a61ab682ce72b011c07 SHA-1: e4a0be26729bfeaa65898fa08ecb4753fb35a072 SHA-256: a011aa3195306f571e5d6760dd64759ce7912a4851373ab90395b06a229a82c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/uplcv?utm_term=in+cold+blood+rhetorical+strategies PDF link annotation
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/junafikubevim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877e3ee1839---34282750340.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/xenoxadegewete.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fafik.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/37487282724.pdfIn PDF document text
    • http://hongdacable.com/d/files/68230875950.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nasewudozadi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/044b10668709bf797ad4cd7d17372fed/vawem.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/72076082514.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kogafinixubusub.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/jixuzusedirosupuxolenu.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pexoputegavifudebadoros.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d857a5dd30581fb91d6fbc740b979764/34761571300.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/28242594232.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863455d917b---sepal.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/eced5c7c1a2abf6238abf8348a109e9d/zesezixalaxu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd9cce59---99222328758.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/50087858863.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0958f2731---34868055142.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/29491904872.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifinuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 17252 bytes
SHA-256: 01897d20ec4f0a72d416d0ab4bb132bfa72a8a4d4e20b857c4e3834163559466
font_01_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 10740 bytes
SHA-256: 243d4d2dfd4e175ef97950510d1063e23d75bbe21a3e381ae4c7fb65a3f5c3fa

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