Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47e1ef3f4805076…

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 20:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48e93f5bf02a78f17bd10c1e05827c40 SHA-1: 925e84423b9492685a1cf5c9dc2299a20e0e8147 SHA-256: c47e1ef3f48050767c18305055d38ac84930df0c6e583338760f506c93c5e114
196 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates it uses social engineering to prompt the user to execute a command, likely to download a secondary payload. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for redirection or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://aldapa.eus/files/galeria/files/xajolaporiri.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c850c52821b---newalarilepegenibibolet.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/75696116798.pdfIn PDF document text
    • https://tipresentoio.it/images/file/firozikufe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/l9idjlcao2g2um15r0gjmuc4qg/43214165564.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301325194478.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/velesetagipil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvko4i66ggphu9q2f2kem0tg32/supebejolikunajimog.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b5b002dcefd3891b99c0c70663cfbdc/62167820127.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdb38b3805---65307248090.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/80472933727.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b693886d402---98833296289.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/lavig.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/jigijaxovewogivuvejuni.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17b35d564---kubexelupe.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3e202aeef---49633282657.pdfIn PDF document text
    • https://inncredel.com/uploads/85562700101.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800aaaab741---93043438920.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/12722077623.pdfIn PDF document text
    • http://medrea.ru/upload/files/78849706862.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cab8225fd---17612208370.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/de326bc4e7693d064bdc6561445e3a86/rufanak.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f04uoiin23td0cuc1t1h1ppcu5/guzazisebijodazefaxokovu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/79426661803.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/71170067025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+install+windows+7+without+a+product+key+during+installationPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f0aabbd9---pudedipigelefagi.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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 11228 bytes
SHA-256: 0a9acea23f608aa66160d207302ffa23ba8fd4b2337d98aeb78e9584c1483545
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 17420 bytes
SHA-256: 45fa059e1f4f4c82fb2782eb6c758d15f3c23f2212121b5e388cae66a7f812ad
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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