Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5bc06abd59a269…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9edef025ec43012e86fc07d0b422d9fd SHA-1: ce488786b1a9a75c960bee4c79fc499ce1da9d3d SHA-256: af5bc06abd59a26979cb425813391aa75a20fa7890b2e11d63f2fdf171cb8b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests the primary goal is to redirect the user to potentially harmful websites.

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://medvor.ru/uplcv?utm_term=live+cricket+tv+app+free PDF link annotation
    • https://tort-art.ru/userfiles/file/wonubazat.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/nojuv.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631575401600071619.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901221023.pdfIn PDF document text
    • https://nexusmediation.nl/files/dozutitel.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/lisukuxepi.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/jeworululinukugiwete.pdfIn PDF document text
    • https://mkontroll.hu/File/73252500362.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/654852694615627fe2ebd3.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/gutoworosafebakiko.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mosusodilivinewisuluvuxap.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/favagizig.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135aced52cbf---95759316322.pdfIn PDF document text
    • http://bienbao.org/uploads/files/48774747242.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/kubavoveka.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2f8f012a---woriwipovanuwuvi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/19487274323.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/97042155133.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5f73de90---piwumabuxotefosigitu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/gotudixefevuwibo.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/78931109956.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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 16924 bytes
SHA-256: b0c5d3893e37ef32b394ca74ee50fb97a1208ba44b1b32932ccc45527bc91177
font_02_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10148 bytes
SHA-256: 28d21af440b56127573654129cd9a2e5d3ae035e03856f97855ee02cba16c7c4