Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9f1e18953eb71…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 14:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02fc5e7d21ee6cfa81f452d82b095a1f SHA-1: 21fe320a857deee9857ab839f55f9d4bcba65af8 SHA-256: adb9f1e18953eb71cefa9aedcf2322a32a797ebdfc0bd8e60fc60092feee6ab4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based interface designed to trick users into clicking a link, which redirects to external URLs. The document leverages multiple links, many hosted on compromised WordPress sites, to obscure the final destination and evade detection. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=spider+rope+hero+man+game PDF link annotation
    • http://tuyothuyluc.vn/webroot/img/files/rezegelab.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161500cf0c90dc---xororasajisolevimapiv.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/xotudelufefem.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/29626261482.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/kusetaxijejimagiwufa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16149c8dc59129---52330144295.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/risup.pdfIn PDF document text
    • https://denimder.org/resimler/files/dibosum.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/5506002582.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/47194064219.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/52446294251.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nepupajisisuxeviximokobu.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/67927764366.pdfIn PDF document text
    • https://fobh.net/userfiles/files/49608522266.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zixewabit.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/75143226031.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23430881644.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/vugemebozikujinisolig.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/xubigede.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/gonakigaxorupa.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-14/20210914084834422320.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d5a2ec96ac415b9ecd39b23136803a81/5004104973.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7bd0e7f---52668973748.pdfIn PDF document text
    • https://breedlife.com/upload/files/41894688541.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/kakitetotutomivupezunid.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210919122604.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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 10604 bytes
SHA-256: fa7f2927aa289eb3b067346b92f7e2d06f145e407172ba3b5bb470364d44d9fc
font_01_sfnt_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 14348 bytes
SHA-256: 386db983b1a4144da277757ca01cf12581cde27efaa4fa3b6ec2d5a9817b274a
font_02_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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