Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dac5dec28c3c49d…

MALICIOUS

PDF

122.6 KB Created: 2021-09-10 15:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e84185de949339f3327180b9ea33352 SHA-1: bd23aff9643c8499e2a7a097a012515d32dd68a2 SHA-256: 7dac5dec28c3c49dc644bc589af7e3fcc07364646cd1434b6d04bf96487cd47e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://ketchas.ru/uplcv?utm_term=sistema+nervioso+perif%C3%A9rico+pdf PDF link annotation
    • http://www.tomasjelinek.com/img/pub/file/sugenipe.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46c7f2f4a---40877181981.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/jamawumulodexokula.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/laropibevatirofobiv.pdfIn PDF document text
    • http://crediramasrl.it/public/file/negudula.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/45254423743.pdfIn PDF document text
    • http://oilspecchem.com/files/ruzeru.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/40027112743.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/ruzopi.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/31754989447.pdfIn PDF document text
    • http://mlight.cz/archiv/file/69205964543.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/45396435994.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/29108238723.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1200dac---jazuleta.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907090402.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92fcd5eb9---42581489400.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/2371786113.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/86020348361.pdfIn PDF document text
    • https://negaratoto.com/contents/files/13765899345.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dowajusenukepajokeg.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/45224805860.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/85715836468.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/48029596279.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/jutipow.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_off000173ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173BA 11032 bytes
SHA-256: 1f55b5327fa3f25effb046d6c0cc0ad129f9d9d89aa617825c36eddb0a88a46a
font_01_sfnt_off00018d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D12 20752 bytes
SHA-256: 195f651c3bea482633f9a82fb32edcbca6e974a533ed89d7901d3e24ddea08f8
font_02_sfnt_off0001c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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