Malicious PDF — malware analysis report

Static analysis result for SHA-256 9813c817921d7c68…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 14:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37ec4c6f5b363e70ec564b7ec7c78e6d SHA-1: 3919fe67cd04ff15dba11481d498e91a49d94532 SHA-256: 9813c817921d7c6869c5ba6eb1ecb05333b2ae48563256df09849cc2c109f31e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://krisoc.ru/uplcv?utm_term=why+i+get+ads+on+my+phone PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/rofuzi.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/5684242951.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/6325556887.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/58926909610.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63070663531.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/mexojipizofulebezamesodeb.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/79127182881.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f10cb9b862dc028b219b462913b210d5/80229496954.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c5205b4160a1ec28810fb2b09d32992b/57617058448.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/95m9uj6c2su8966nudosdqu5ki/narijavaxegedipovadam.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/90991798375.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/99250133179.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vuwulirawed.pdfIn PDF document text
    • https://emenu.hu/editor_up/44891055895.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/puromuwuza.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210907180720.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vupalekajug.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/37600264960.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454b65c282a---golejomo.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/rutakekagoradivenosa.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/notazexemerowiji.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///6648863201.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e0e874e0a8fb3b8f72906a38a66b89fc/vedines.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/buxekoratamonifefadipofi.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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10800 bytes
SHA-256: 3cbacf2917fa6b981238a20cf1fa4fd51574fac6a4b808e224a57fa9963a6c6e
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 18344 bytes
SHA-256: bf96066703068b0a964406e02947e04cd26254dfed45aba544a36771e20610af

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