Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02e4e6bf3a9e8b1…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 13:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9088b5626eb46678aee4635f8602bf69 SHA-1: ef177211319bbaec7ba77d071db78ea1a8fda11a SHA-256: d02e4e6bf3a9e8b1d2b93dbb4e8078f8c686c35a86589c488154f999978ad791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to distribute further malware or facilitate phishing attacks. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a malicious purpose.

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ffdee844a31d4ff3e771c322f92482c4/xubeg.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc1c82c69---15102236564.pdf
    • http://teplospectr.ru/images/files/tizimijirusa.pdf
    • https://invest.pl/userfiles/file/9567732151.pdf
    • http://asiadomainstore.com/userfiles/file/badabufixefasol.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j5pah5j7hq7nc81m5llm67tdq5/takunetakodedumiweni.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/86d5f83d5853071d6936fe4acda50108/46591557094.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b665e38be7---ladokevuwo.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o6a4o4dchg3u3v5ofa73tnomgp/53538749377.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jdakvdnqllqhslou6fh255cm1u/tuforadovanowawekigoluz.pdf
    • http://fertilityupdates.com/userfiles/files/47708591482.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/684e0908b420830825a8c0a733318879/bezoj.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e62547724---peletipumuwi.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/25951d46aa39d5e420a9632fd96d014f/pemoniruje.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d311755b10---liditosagabamili.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e26ea9696---rofuto.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4nr3m34kcr98nfu7oq5lef5j0u/14161585223.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaa8964c2---semalemidapurawitebeko.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160840764925fb---zobemineb.pdf
    • http://ahlhy.com/uploads/file/011229585656.pdf
    • https://agrimal.pl/userfiles/file/83926653589.pdf
    • http://balogmihaly.hu/UserFiles/file/47643118233.pdf
    • https://go2germany.ru/files/file/74102784242.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/tokolako.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/494d6f425cfffce0705120c4d8d4ba10/jezesevoderobibubufofagop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hatha+yoga+for+lower+back+pain
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e9.bin
ca759a9e05d6158a2bfa02520b746865a32823dbe4a4fc30aff12175d366f995
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 11016 bytes
font_01_sfnt_off00010e47.bin
c91565a503b01c68ad56b21a81996d166b834837fe4e5dc35ffd41a939226fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 17316 bytes
font_02_sfnt_off00013aa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 16792 bytes