Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bc09f9c4d7427c…

MALICIOUS

PDF

96.6 KB Created: 2021-07-13 18:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2cbafb0f8972f386c8c3ba1596c959a SHA-1: 22253e332f0fb4096d1911f59a82bb4a29b5149a SHA-256: a7bc09f9c4d7427c1dd99fa1b8ce3060240b070f87cb0407e4d18ed79f520d8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were found, the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://strandedtattoo.net/file/gabajavonaxipetafepe.pdf
    • http://ausafe.net/images/art/files/87617259868.pdf
    • http://finpacecuador.com/userfiles/file/jelanus.pdf
    • http://aarogyamedico.com/userfiles/file/50616221707.pdf
    • http://onlineexpert.in/userfiles/file/sajebolajobobevine.pdf
    • http://msamerica.net/clients/873634/File/didofuzubekod.pdf
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdf
    • http://gancza.pl/userfiles/file/18983816128.pdf
    • http://beloezoloto.ru/userfiles/file/86525759148.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e59a97e1d---kigugerusoxef.pdf
    • http://ramenzoni.eu/userfiles/files/furadatijujevibumiwadep.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/96125602551.pdf
    • http://adance0112.com/upfile/editor/file/dadudekepus.pdf
    • https://rocksoliddesigns.biz/userfiles/file/pudikosegekulewuxudon.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f409a6a61b---buziweva.pdf
    • https://transport-vehicules.fr/userfiles/file/zegokefavofe.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/14126481136.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8a9b113d---73367458567.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082139bd067f---wolawegomelo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1f954585---67651501930.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/48829cf43ef67a59b600fc60de265589/teduwowidevetukufiz.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cef81d773---tudafefuzipedogab.pdf
    • http://summithigh75.com/clients/867147/File/lekuwete.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d047657b58---zodufopazagakon.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c5488a3da95a9025e7adf18317402547/30486024769.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160982ea6d137a---22675913850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+love+you+april+fool+sms
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbe.bin
ae1a34caed41a2936b7ece1a06d1359488c9c27457b5be9ce91e4d6a7e093b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 17956 bytes
font_01_sfnt_off00012ad1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 16792 bytes
font_02_sfnt_off000142e8.bin
be63660d2c48c5e489af1d4c711fdb7154cd6af4869e22bf1eef55c5df96e2c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 10548 bytes
font_03_sfnt_off00015afe.bin
0bba99de2bc9648b9dfdb6515acbfda48f8a2f91904e7407b1532f2d66b5973b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFE 18172 bytes