Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c37e2a15a0db95…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 14:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa95ed4545f28ae42fa586ac0ecc53de SHA-1: 305d03fca2ee72f6a0db01e8dd4364775193844a SHA-256: 69c37e2a15a0db95bc1d6bc40974f7a57fffa7c568e310af2ebf6794d1211172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the detection indicate the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=even+and+odd+numbers+grade+1 PDF link annotation
    • http://lex.tj/img/file/15075637440.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/24875029166.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/23138986840.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/pudamogamareluxab.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/54533974562.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/rizumawuxodofegup.pdfIn PDF document text
    • https://ms02bet.com/contents/files/65023243365.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919061417.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kukirugowosupazawozeteli.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/sixitala.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/34881086369.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/97035926842.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148adff7253e---tawoweraremuv.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3078cf917---zorizoxivinotezenatowaw.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210928182331.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161300c59c1e64---98761571541.pdfIn PDF document text
    • https://medtek.vn/storage/file/fozak.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/48738437914.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/42014809356.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210917_011207.pdfIn PDF document text
    • http://twilaw.com/files/files/70635945758.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_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 10696 bytes
SHA-256: d1cbd4ece6df3681f826e0457c0613730b4262bb40f439c57e2a7ac87379ed82
font_01_sfnt_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 14516 bytes
SHA-256: edba7e3129efa286968b6bd2256d630ec1768809973513ca97eb08f905217e7d