Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbc41d5bdc41fad…

MALICIOUS

PDF

90.7 KB Created: 2021-09-22 09:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b36bac59e27aa17680ebe5e4e40ce223 SHA-1: 37eff30fad830f6de60d50791c0ed8942147b13d SHA-256: 4bbc41d5bdc41fadb03fcc64e39caf2568c25a813bbff3313b91559d5e2d71e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=apps+to+spoof+pokemon+go PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161391dad33060---xewemef.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kuxakewodanopinazetuje.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/gipakug.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/masubigon.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/bujivuvinepodikajetopil.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/jokiw.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/46612974649.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/1672851829.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kiradazulan.pdfIn PDF document text
    • http://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/85113889859.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631519271.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/wagugisisiripapu.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_212932.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sumofubekimox.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0d38942bd385a82dad7dbee06ff18241/77122586694.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lowerevenijikalogofaro.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f2a680d926e2ec3744697261b77f950/tapifafilawal.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/laguraxarugugejixapugut.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/fudoxunakotozanosi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51546101556.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/57387355302.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/91620885611.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/29592760668.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_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 18148 bytes
SHA-256: 7d58862842a3def8a9a1ef91d6bf242da65cf9f963b85a738b3ed231f52189ed
font_01_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 10372 bytes
SHA-256: 0b98c31ac698f2e6763dd256916ad2194f99acd2b315d4330c5d0ad05f2fd31f
font_02_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1