Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3610d7e7f33165…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 11:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32060057ef06b12050f5299a4a96e24f SHA-1: abdbe884c90d988d51f2dfaabd37f4d0861df05f SHA-256: bc3610d7e7f33165df33c16d35062e4f1320e32470265209bf0125f217b4256d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=guitar+hero+para+android PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/68075c5fd3a9b3f1b7f26a845dff2ee9/wizejebexixe.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/ragaletegesunobulabon.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/22886824256.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/42833710702.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/mexisopodegugigo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/34263869016.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/62882557945.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/13d1ccac2309927bd8ef87f18cbeb7b9/lijilubunuvarubew.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezakutowibeviginekaba.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lajijifusorozarevegunawi.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/55105138418.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/getowad.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941358a632---kalirowewasas.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/derajusujukidazuxaxives.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/susodibibasolabaw.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/zotasosupemisinukaz.pdfIn PDF document text
    • http://dentherapia.hu/files/file/67952198208.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zigedimekikolidakuvowefe.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/minixexukunufadep.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dhv4jg5hjcc5eqtj0fc9o3iudu/12510076061.pdfIn PDF document text
    • https://msvadba.ru/files/file/navovoxodejikoweba.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/42938533481.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/98906360147.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_off0000bbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 18144 bytes
SHA-256: ead8389b8fa92f19f105ca36810c7dbd03914720bd56eaa4c45cc397d9a29e1f
font_02_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10416 bytes
SHA-256: 61afb51e4ebe49d5017f12eb981fed1c47224744d064f73fcca48ec64c418c4c

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