Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2f031a0bd47d04…

MALICIOUS

PDF

88.0 KB Created: 2021-10-07 08:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bdb4d952619257d6aa3c7ec59a41f99f SHA-1: d335779a5270fd4709a944bed03210696b4b5b75 SHA-256: 3f2f031a0bd47d049e6ff82804863e92163430d4e4de259948a1614bb3559188
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 document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ezokniga.com/uploads/file/katonij.pdf In PDF document text
    • https://marathonroller.com/userfiles/files/42024730359.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/63230319060.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/9114535922.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/4741034110.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/rosapomix.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/bosudeseradebumexonek.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/jifuwudila.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/63966446312.pdfIn PDF document text
    • https://12shio1.com/contents/files/pogoxesogodituwibu.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/30625357065.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8b56232fc---welobobiluviwobikonesu.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/91476164982.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/68659244560.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/kimelipedufisesazepabaju.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/15235634794.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/13299411440.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74300331476.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/sogizorozibulalifuj.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/genepaxuwuj.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/9180267533.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea6a287d9---jidumarisipebejorepegutos.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906104617129583630.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132e48aaf836---80228330442.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/57862993977.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/77581998357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cormac+mccarthy+the+judgePDF link annotation
    • 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 10784 bytes
SHA-256: 9da9bc3f296860d2a936b6cd20df54bfb720d8e0453161fe119c38017007d8ee
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 19948 bytes
SHA-256: 27976acdd1d683042c2fb074c3181eba5c6f01861375b99065a929424485d5db
font_02_sfnt_off000139df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1