Malicious PDF — malware analysis report

Static analysis result for SHA-256 7409a31ed5ae08ca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 650b11b6302c39fc056f42df3c02913f SHA-1: a4f58288402b17e414551708c41572c58a8953c8 SHA-256: 7409a31ed5ae08ca9139894255c8272f4d79cfc706be9d1b8d1345b242b2850d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress installations, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc55c917db5---24149991981.pdf In PDF document text
    • http://eaas-journal.org/survey/userfiles/files/kimaf.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/s9n3rhb2u0rue53k5jem5k4rej/50457462769.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9705dee54---65832442363.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bce556d750260300f2969ed1c12fde3f/90445517627.pdfIn PDF document text
    • http://ustunongel.com/image/files/xazofisafaz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa69e37e1---4200619197.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0497cf1e85958703869b2ce8c3b937b7/besutilemux.pdfIn PDF document text
    • https://europartner2.pl/uploads/38753353424.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/putino.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/fexemumolurepej.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/29438216541.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/60105162384.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/96754097460.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/87271598208.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6dd509d22---newive.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f7586a6a36b2f2b01d335a39ec1de513/95606575471.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/siluwojukelodiwirel.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275f2d468a---sedajaxobimufevisupu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/48581235091.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/muzixuzapomugov.pdfIn PDF document text
    • http://farmina.ru/uploads/files/peresobej.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60dd9a0024268.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842a6744d77---41822907223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=geometry+distance+and+midpoint+worksheet+answersPDF 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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 17620 bytes
SHA-256: da7ff2650c7d21761aa2388bfedb293000db11cdeae5291bdb429421706b8bcf
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 11064 bytes
SHA-256: 6a4a7475c911acdba99f4434686831dd061fec92b692584fe1005edb3efc6611
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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