Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b75f867e6b067e…

MALICIOUS

PDF

102.3 KB Created: 2021-09-05 22:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9af54a5d093e4e6286c02202a5dcab1 SHA-1: f8c81338f626512366f968d5e59145d76a65a986 SHA-256: 99b75f867e6b067ef6199eaf66a928eff5228682e83a185ea2db4a3df3719af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=capitalism+without+capital+book+pdf PDF link annotation
    • http://kompletucetnictvi.cz/files/file/rasegavifetemogemexipan.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/jewuf.pdfIn PDF document text
    • http://sun-tes.ru/files/file/32497711406.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d6b70436348534db2e84ddc26760d6fd/gotalirepezubigufa.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20e8354a9---86841189727.pdfIn PDF document text
    • http://yoron.net/up/files/14874698050.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/283hr8tv84hq6f23jfq9aqabd3/31854894210.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/92536251836.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b6c5826a16994ecfb13c8d61a6497ee1/bubalegepulorazarox.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/86604890181.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/gebelifeve.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c109ebe8ac5---vexasuruxinuraze.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/22ke69bonhofa3dkvs0aggbnn5/65833606419.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/56644431775.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/laxamabapiruvexexu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tewexitito.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607893deb9f50---sudiwugoxoxoloz.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/nefakoma.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1629148000.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/37733558263.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98bdafd8---42778535854.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_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 10996 bytes
SHA-256: f28f6d99664ff64e0f3c08ac0682f4ba6101f886789e97b87e9f85274aa31d42
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 19484 bytes
SHA-256: 88bab71066ac969082a0d9a845954cd62c9e6501c749257a701f3719467a3c8b

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