Malicious PDF — malware analysis report

Static analysis result for SHA-256 744c8ba20f2c5355…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 21:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88341c3b3f61890ab0e6ab987bb38bf4 SHA-1: a121bc45b8f2e113d40d530f7400f69f38493a13 SHA-256: 744c8ba20f2c535587427d68a17c6971126f6985ef4c4192ed18064afe697003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=bhokal+comics+pdf+download PDF link annotation
    • http://siblom.ru/files/upload/file/80659469031.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e67299376---22989640528.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/46382331662.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090601075165.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987abc6fdd---90149783333.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ujcdt9d4s72t8579om78dr6br3/70319463851.pdfIn PDF document text
    • http://krupongs.com/images/file/tuzapu.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/29508778867.pdfIn PDF document text
    • http://m2m2design.com/userfiles/24505840618.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/misudevonunurawepetumu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff45d3f29---4539969189.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bilitatatitevufidifelir.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zosigilamevewarapibubupi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jaxona.pdfIn PDF document text
    • http://henca.com/files/details/file/fukutog.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/32607206338.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/tiwexibemesef.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/3224022237.pdfIn PDF document text
    • http://gyliver.ru/files/files/nomixazo.pdfIn PDF document text
    • http://prestopc.it/upload/file/bijefanebujadivofaguka.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jufepuxavu.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/47792890795.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavivudam.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_081004.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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 10784 bytes
SHA-256: 48cc4936bd89de602ad7844c5f09684e37e1350ef1963f9cbb1557974d684c9c
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 17136 bytes
SHA-256: da1d7c8c702fee91b54058a6949ccf5228c51e666581ce843414dad175b14116

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