Malicious PDF — malware analysis report

Static analysis result for SHA-256 010ac4dd1f857caf…

MALICIOUS

PDF

74.9 KB Created: 2021-06-26 20:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84872f518dbeddd34f033b3146a5255d SHA-1: 579540022eddcf4d02e448289d5e534bbe353966 SHA-256: 010ac4dd1f857caf3020b39f79b67226c23ffd0a0863c4ce3cbcd1877d55a7c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the nature of the embedded links and the overall structure are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=hpn+to+phx
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/7e9246b971b7562fc2c87d2ee6fb1209/sifozibedajagew.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmogml0eh3epn9lcunh0jsacs1/moxabinasagazemelaselure.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077768cc54de---90445303209.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd20fb05449c7dc9a3bf95754dbbc444/41585796556.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c52b220---18837902816.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32998049c---42192249108.pdf
    • http://xn--e42bt3l.net/upfile/files/senaludu.pdf
    • http://sbox-technology.com/upload/datoteke/30423084026.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/73ba522f2abac5e833af78f87e0e73e7/sutididokesuvasetalovoje.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9ve5d6d7flse71qvs0lh9kj000/79061942278.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/fb798677690809f068f5f7885c178833/barajabiremafemelo.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8fb209a4f974acedfb3e13ec85fd3045/pametokeloxolibavurowa.pdf
    • https://estoniapools.com/contents//files/musokizowapisobe.pdf
    • http://batiment-tunisie.com/userfiles/file/22368755875.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a47cb0d90---5947914276.pdf
    • https://chaletsuenodesol.de/files/38916315200.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ead9daf9945f87afecc5c4e0f4b91c7c/tojuzusawigozeliragaf.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f83a27528---kenobimitiwubud.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/83b21a19f4c583ff7c4fb1d460cca857/56987234956.pdf
    • https://kovtec.pl/eurostyl/photos/file/55970647123.pdf
    • http://stjconsulting.it/userfiles/files/29192102723.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l3eq355h3ikhmhlccsgtis8h75/fexujok.pdf
    • https://asthasupermarket.com/userfiles/file/lonekuna.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077494ed254d---jogivitumikof.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/81413867183.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed811a24f---lutuvikesaviramudiwubum.pdf
    • 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_off0000c3a4.bin
b2f58917221f1cf150ef58a07708bcb97385b1b2b4333a7277ae3df9457ef7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A4 17984 bytes
font_01_sfnt_off0000f19f.bin
e58a9b8f3f361135e82f4d2b1075c580ec2f7a0f0521264e903c370cefad6e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 9740 bytes
font_02_sfnt_off000106ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes