Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfad088229d22e0c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 03:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abc7f252f18c9e0d57f2d2648fcd08fc SHA-1: 2953bbdcfe05efad55afb011b39e1c3e30230565 SHA-256: dfad088229d22e0c4cbfd8eb1d1a09e35ccedb481bfe4d5d4eee37df6d89ff74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites or phishing pages. The presence of these links and the overall structure indicate a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=literary+devices+in+jfk+inaugural+address PDF link annotation
    • http://samafb.org/uploadfilefiles/6759899578.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/mafogekariwipajazavulis.pdfIn PDF document text
    • http://altinay-law.com/images/file/98945835615.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a729d7a61a---gifavalu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611261fb09b78---dibulexusiwatewivovig.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/titenale.pdfIn PDF document text
    • http://ozari-ua.com/files/file/razevabiva.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/27819983cdaa2eab4f341ac3f4b29fc2/87637036327.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417973543d---gamedigozekapuzonoze.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jegeki.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210630050757_7wm8vp.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/29238026213.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/24889055446.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pekej.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/12517931092.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/86551101346.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/95708655346.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/nasibozuwururalapojibosag.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/rikivewavozarup.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c693cb5db27ec0ac0b6699c2b4f3d21/paligajalok.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/53324519351.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nagidomominurixiwemenazu.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/26482612529.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3b5346fbe684ea0b20cb621ce0d4d329/86115978971.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/71883576319.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pinusavaxefobunixat.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10992 bytes
SHA-256: 18639c08d18f4ea00f6eadb69ffe71e82f148adc0e9237534dd58b0720b873c8
font_01_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 17992 bytes
SHA-256: 7c255d34797ee3c6e597725ceef0df64ae80f26b3bbb3629d6cebd4300591356
font_02_sfnt_off00013fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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