Malicious PDF — malware analysis report

Static analysis result for SHA-256 097da5a8e069f4e9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 00:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f631472ca39f4ceccae6c5d32bd234c9 SHA-1: 2158d30f968751902f02061db642a0e32b6e1ce7 SHA-256: 097da5a8e069f4e9763e6598b568917e672d64fd93f8c0e50726574b871022e6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The document contains numerous URLs pointing to compromised WordPress installations and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf09798e4---28001399416.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/733b39b6ee065f37ffbb1d058718d127/bijewipisugedibuw.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mapodibuguti.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/tonivufivegajifiwijad.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f589bc39417---zepodaxexeputonozer.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4959t9kfija94hmef2tfgfdqb/risimizevabupok.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e836037527---nalovunivunalupifasodom.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/lokodadijewugivegofidid.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/gemeduwoduromesivilomivi.pdfIn PDF document text
    • http://119pump.net/d/files/31994989433.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/rijepod.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/dasonusewisijuzoniruto.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/ruzatuzipenefasuwakonulij.pdfIn PDF document text
    • http://inncredel.com/uploads/nowagutexafakamiteve.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752ee3b226---nigigutavugavifokexak.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d868c76ce468a37b5b9296a1c00543ef/15069280183.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/7761105028.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210626125943.pdfIn PDF document text
    • https://papiratisk.cz/soubory/58065661153.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/45835182522.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xumuvoloxilaxisarugen.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b7ed2d83eef97319a5286ee51e7d832a/ziboveradaponigaxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=theory+of+applied+robotics+jazar+pdfPDF 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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 11020 bytes
SHA-256: 30740529339564bff43257d42d8870e41ed2a3163846b0522bc40d8a2587c29b
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 15356 bytes
SHA-256: 212fa641c8269bf1c6623947a9a44ab4e19185372b6bd0bd4a7dedf9480e21fd
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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