Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ecb7db1558504…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e86758dbf3d464cd0831bbfb08cd2024 SHA-1: 42bfa7287c753872feba275d6a539c0bb1b71f3a SHA-256: cf3ecb7db1558504344613a810a4508317d855da39c70b7e40c20b90458dd2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dixon+catalog+pdf PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f498f4b3f145628c6f91947d6e881591/mopesuguw.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/63199568603.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/37f665d6adb6ab1092cc774c851528b5/17878618627.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/xumikexovana.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8fcb667c19ff3bd4d1696363cabdafb7/39397505419.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/rerovo.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/30969838224.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/58182787052.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/71162219286.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bdf28c63388532da7010a108c07b2d90/97101901915.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/tijegivufisogararer.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b47bbb4a5---jodadatunupa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/68993953810.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/topvvse5kg072ikr7av723vd73/24256029392.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/63935361191.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/58779994269.pdfIn PDF document text
    • http://rafaelokazakov.com/file/38156841427.pdfIn PDF document text
    • https://anaksemut.com/contents/files/97039639822.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/borinuzenomow.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ksh8cbcrkb67jib8n7eljgmtt3/44915665661.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/67120253880.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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 17360 bytes
SHA-256: 4ebf30e08615823aad119c2309469779e4695ff9f5fa7c62ae169f7b3d541fd1
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10496 bytes
SHA-256: 24b330262221e7ba1595a9e460defeaf23b5736967a9a045372226ed4751871c
font_02_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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