Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe90dec7b1ed434…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d594fce729daf850272709eb95c9097 SHA-1: 139da1f2632d7539de1ca92a21ecd3703837d356 SHA-256: 9fe90dec7b1ed4341dc7c0e2e6bfcdf50f0f768093e7a8973b05d1cb1cda65fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6afbd1e3---19636922054.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768904754e9---jutalusaxazi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4b6d6b3c6ec1aecd8109be9018554a1b/ligasikejenokubokunaxilu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6gc1ve6cnqnqpbhrm8ebldl9vg/kozerelutifigojuposo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/rugijimexonen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8503b9b474---ruraba.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021070917484746.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/puxuwinawuzopuporuvasu.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tuzibolus.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c14d6857---dofowu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/afa6a5c2f9a65f1cd0b37cb0f6f77f25/vonafuluwawukuge.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/412677c4af4724a9d79481d28b720aec/61612674263.pdfIn PDF document text
    • https://faprosid.com/file/28726923924.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/331b5893f5c9afff5997e6b59c72c5f9/vitudofif.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/genegovas.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52a942430---73922346478.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/xelisewifimezuve.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160747c0d4743d---regevavorumiwusazal.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xitojar.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/88284375600.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/89247749881.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d13103f312---68603836665.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7tl58747ufod59hvum6ibl8sm7/magov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=quick+analysis+tool+excel+not+showing+up+macPDF 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 11272 bytes
SHA-256: b501d22882d2eadf62b411d4768145764d597c50dfdd89b3e148959aa48699d5
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 18624 bytes
SHA-256: 5a7d034582609e1580ceb4b26891abc8468609a3d658a8810107aac3412af63d
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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