Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6bbb9984bb3247…

MALICIOUS

PDF

76.8 KB Created: 2021-10-06 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2dc2d073403630d0ba9a2a4263eb4cb SHA-1: 1ee237d1a3131deecc532b425926197fb0e2d05b SHA-256: 1c6bbb9984bb32473b37c60301fecb230c749ebec6724631df4c8c277f5145d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent. The primary attack pattern involves luring users through deceptive content to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=engineering+mechanics+dynamics+2nd+edition+solutions+manual+pdf PDF link annotation
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/45941710598.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/xexakubuxugibavufimoris.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210923file///sozax.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/togadakez.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84191812242.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/21342588438.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v5ek272ugdvu6ors8f5dher6fr/11350569473.pdfIn PDF document text
    • http://klhl.com/userfiles/file/17804870558.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131417d882c2---24183972310.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec5e3ab4ab---98077416632.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/duxowanetalesamo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82139076911.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/68236271515.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/nofubidikubawi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9c74eed324ad7d256f985ff98f7be934/94246069157.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210920162454.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/89639950077.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/mepisi.pdfIn PDF document text
    • http://ahknchem.com/upload/files/1540068246.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/xenelironozitema.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/13840387529.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/sizegexeworekopew.pdfIn PDF document text
    • https://ismart99.net/upload/files/47613956359.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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 18848 bytes
SHA-256: dc73be9e0c3fe54aebcfb95a501bc39f90ffbf1c666130fcfa70206d4ff08ca2
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11384 bytes
SHA-256: 2b9b05d0145de02027ca0464e4a9ef7e961d1e74f8e5d411b8093c118c809866
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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