Malicious PDF — malware analysis report

Static analysis result for SHA-256 a858b3e5f426a6a8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 12:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bdf7641a3cee394d1d6fd81c5baf37b SHA-1: b8ee8bf768685c2afc345a1cbb73e3d19efc0ef9 SHA-256: a858b3e5f426a6a869e8579110dd83cc3c0499ec1c59da7855e286fc5284629d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of embedded URLs and the 'link farm' heuristics indicate a phishing or potentially unwanted software distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=gacha+club+android+download PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613672fb93246---xadofakatuvafowopubu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f41a7080a---10455119794.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lozizedamed.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a41022916---36249296458.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/35092557184.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/misevukefopuvedudobu.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/peworufavofuzotalar.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/82419648683.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/fawigimo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sowagabewudegagetuzemogod.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/timidevupodivegive.pdfIn PDF document text
    • http://ux-school.ru/files/files/18655716474.pdfIn PDF document text
    • https://nls.vn/upload/files/90915951823.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/34639251888.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kigalex.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613483953a260---19631185349.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/68321005766.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/vinozezaseroja.pdfIn PDF document text
    • http://inistor.com/ufiles/files/95528633049.pdfIn PDF document text
    • http://enricobarraco.com/files/jokujexojoloranajopu.pdfIn PDF document text
    • http://budropol.de/Upload/file/wikidivuzake.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xiwus.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/komewajopapowigipape.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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 20116 bytes
SHA-256: 74485ed993ae47982f8ecbd4e58bd5dc558cb964151b4a54923c5059b5857c21
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 10432 bytes
SHA-256: 8c7c0f8e31a2ae7755ebb1bfe9634c0bd532aba3b041f1290e4cace146661052
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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