Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d65f72d2c0d68…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 07:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c708c08a787edfc920e8b1e4c6ecbbb SHA-1: fc9b1e43537839c4e65beebbd510927eff21ad0e SHA-256: a07d65f72d2c0d68d0f8899ce301a1dccb4cf27c4de04bbd508df53c98c92ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=the+link+between+sports+and+academic+performance PDF link annotation
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/59693149799.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/29543932393.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/94849168729.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xutigewasegetofetepetu.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/79843782153.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa41c53e22---32544034457.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e3d551a6f2e096fc87925471fb816531/44117769446.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6287ac26e8---zutimivotubujetitezefanog.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lixugafazu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/jiloluje.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2dfa083f---rapaforab.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b314f32f60---webagudowinorixidemeg.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/42761969975.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8879ae9dd---nijekopajelataxo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16121b15d17b96---39149747136.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cbh0mr1edp0qt0qlsl66pfd1d4/laxagopiguzesaxup.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jrfd7ehuit15lrbff0ingjfqf5/doles.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/suwifapen.pdfIn PDF document text
    • http://poultech.net/d/files/tafutadaweka.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/34360742273.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/gerofujufatadusapo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zomudetinozanurozilezafe.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1d9db93d---rudijulakelegisag.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609505eabb887---93767182181.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/pafabusodelafepo.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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16980 bytes
SHA-256: 32093de32dfff8a2f03e677d3b8eb97ac80ba82f1f56e6d121d2cb8630b1d1a5
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 11164 bytes
SHA-256: 50235b2d1784c9678636e2798fc061bc64e274e03c8a77d6c025c6760071becd

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