Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ec0cdaa7f00409…

MALICIOUS

PDF

82.6 KB Created: 2021-06-30 22:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6f08331d46d9b470a6d4609d9749ae69 SHA-1: 6b4a6f0eae686f2e77fa29e67b96273989afea3f SHA-256: 98ec0cdaa7f0040983779ebfcb971cad230465780851d816dc251987c547a21d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains a link farm with numerous URLs, many of which point to compromised WordPress sites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using these sites to host or link to malicious content. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cja8ig4e0rqbg1n71bhqdu7siv/magowumozawafaju.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e6bd0cf8706f3b41fb07de57e41765d9/77630481510.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/bexarife.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6422c182581f97fb1f84d8ac9b79a012/jiwifivulezimuti.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a048f33a6c---dipurelixafedabivamaluraf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/53c4661e90edb899de39c11376485197/44214272366.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/14961599582.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8553b2f174---bedujajisabolatepaxewa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90140496640.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b3470af4cf0cd45c7fe2b800191d6a7/gaxewiwopemixodajori.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/mewozobakam.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/tisuguf.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/21946972799.pdfIn PDF document text
    • http://funperm.ru/content/file/83958112224.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bo5u98s3uesac1ka28ennkq2c6/zuledafulilajaxotoxokag.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/449ddf71ce34e693f702721782d102eb/80224077051.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607287b503c75---dogisuvujitibevana.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/hk15rvk8gj4l7uaad7egfblb4f/pumakob.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082edea27ee8---61857027510.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dea24859c287b2f7f4e6e91cc8609e4f/17929456609.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922589e851---40542485177.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c478f1daba275b2e86f0fc613d6e453c/rozak.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/311514880.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/77555077665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aml+training+questions+and+answersPDF 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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10904 bytes
SHA-256: bc78080e8be628860144e529fa18057dcb6bff24d397538c919ef5e4ccf8dedc
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 17340 bytes
SHA-256: 3fb039e73a76486533407a01202381e0cd4fea876609e1b4c89cf48f8b7dbe1a

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