Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27dd21f8474da12…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 18:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efe26d0ad60a4db90fe4722fad508d73 SHA-1: 67b96408ba82b026ebe97a1286c1c050296e4eef SHA-256: f27dd21f8474da12a0eca853670aa2146f42f31766626186c84438f642b6db7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with 'utm_term' parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=rate+of+change+worksheet+free PDF link annotation
    • https://ceccarmaramures.ro/userfiles/file/22220532633.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631013623.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/63601567896.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161357b210bbe5---1316440421.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bitadafogeririnerem.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lerosixobavamanefomu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pagijebepoxonogut.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/mefoxosirawawobipat.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/83401122312.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/41026172856.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/larejelugosokexe.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/1279274460.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb5fa9656---52114141591.pdfIn PDF document text
    • https://motoralbini.it/files/file/wulivebula.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xudomenatu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/43307759444.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/30044005942.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/kikeredujoramogidax.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/61340268628.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6cc4da2c---42501027696.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/juruwununetidadinivi.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/9906862260.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/53087499636.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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 18484 bytes
SHA-256: 488527af44a3ff4d13929b5157a9107e68ca05d0fbd50338156abee53335eafe
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 10700 bytes
SHA-256: 445ea8fb8485e2ab77991cec965d49d5de84164892291334c9f47e2545a03725