Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42436d6840ff2c0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dad5b37b807ee4c2567a815b53da3c3b SHA-1: f5ba6c97eb953f1a4e2068c3a9f523de8f07c8fd SHA-256: e42436d6840ff2c098a0ed006159ef62860f7cd34dbe017fa6edd72a2bc2e027
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential harvesting lure. It presents a fake MFA or one-time code verification interface to trick users into submitting sensitive authentication information. The document also contains numerous links to external sites, some of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=apple+vs+android+comparison PDF link annotation
    • http://archidaldegan.eu/userfiles/files/jajiduvalejevejisil.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/81896344740.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/sunijegubixudu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912845472441.pdfIn PDF document text
    • https://mar3ol.com/Files/files/nufeparivirusamapumabufe.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/40860911776.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/xamujalufo.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pawakamimep.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/27691354897.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7b8ca291---zafeti.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/vapimidebukiluwinuxexo.pdfIn PDF document text
    • http://kechengchem.com/upload/files/pobuvenasitod.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb6fab77a---34854128015.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d4cce711---mepevemijemifawemajok.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/valazonolaxigagedav.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/zepabuxupimag.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/13099710492.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/4962965184.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5740029c1---40968302145.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/kezobefox.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/felizi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rekekimekuwufozifuzoxi.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wibifuloxusotoliwu.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/nekusujaxesotuz.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_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 17200 bytes
SHA-256: f12352f7b193500ba252abc600624b3e42634fd3d82b12c3941f58d2ddda643d
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10624 bytes
SHA-256: ce9de153c6cdcafec914fbc4f8438b4ce632c18274eaa30c0570cf8c29a90c78
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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