Malicious PDF — malware analysis report

Static analysis result for SHA-256 754412799344d5bf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 09:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cef7cd9b0cfcc003c28dc90167eced01 SHA-1: d5a78ba24bd4e51c75d141a1323bce01172d0ab3 SHA-256: 754412799344d5bfc6726ed237a5316129cc5d5df98db7189ff52021b9e78b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious external content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fautographie.org/images/userfiles/files/vurivowoxafatiduzezer.pdf In PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/vvasref2csq05ki2gu2i2smg7s/47106501213.pdfIn PDF document text
    • https://renetravel.ro/images/files/zevomixijukovuma.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9f0063a3392d921754ba90f599a57ab4/vunumejakesem.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609041b705848---vaxodedirupegoberinesa.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/84139301631.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086023a50409---86836453515.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/13867982320.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/84826247883.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210815/files/20210815144608.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjqrb8vsmuq146od8kkn679r1i/zosugowawidesuvazirun.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/xinesex.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a55b8a8e0309b0a72f26804c30771e42/paselilabosikenuvaw.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/gibelusobitofo.pdfIn PDF document text
    • http://stattus.com/assets/file/tididagifelobufemafow.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75b7b93f7---59645916853.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002b4c49c---2228039801.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/kukodemov.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/80953851907.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/doduxulor.pdfIn PDF document text
    • http://ubest.ru/images/file/zusabavowizibulir.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/98701679629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=celebrating+diversity+worksheetPDF 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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 11056 bytes
SHA-256: 4d6be5c766178bc51295179980aa51f2a3d70d146f79f0003a7d454631b05110
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17732 bytes
SHA-256: e837e8b61d617f96ff72fd17f79f9cb2acd5d5cf591983e98b88b292842737f1
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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