Malicious PDF — malware analysis report

Static analysis result for SHA-256 6391b67fab154c4e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 03:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8bc29c7b2c629e5c16f5f2589f02ef4 SHA-1: 2449ca129f3d36fd7ec76ee5282cd7500d122380 SHA-256: 6391b67fab154c4ed067ddd78112bbdbac1ff2d76901041d0fcee437203f098a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to improve search engine ranking for malicious sites or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=macbook+m1+android+emulator PDF link annotation
    • https://healthtecindia.com/userfiles/file/tixelipojakim.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/98469480547.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/33392499172.pdfIn PDF document text
    • https://ms01bet.net/contents/files/75753364181.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/zexiduzame.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/deraxisunatopemesepiritid.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f3388cef255554d7040192259384a38b/gugopotokelojobuxutatix.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/sutifevojiberidubufitosi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9131b46cc---56118121001.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/foxujavuxen.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kinuposiwijeg.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/kevoli.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/zatemakaperurutomixeriz.pdfIn PDF document text
    • https://nexapos.com/upload/files/wivexufararizowan.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/84117636563.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xiwuvakizarejowovasipaj.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/55382551769.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5168a23e4ff08eb443cd2a87bf207102/dudofemapekenexod.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xotakipuwujag.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/80562688832.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161486b6e60de5---46695372602.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/gukajar.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/mibiku.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/jakavupofufimosevajoja.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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 10740 bytes
SHA-256: 0b6eba08b5a53ad63d1bac3747b77aeb849ab9becd5ac0c8833cbeb6668d355a
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 18236 bytes
SHA-256: 249487b4b7f6a99007b9cf7a681611aced03733f7ebfebd001c429b23d4419a7
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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