Malicious PDF — malware analysis report

Static analysis result for SHA-256 0863d4d60e2e082f…

MALICIOUS

PDF

92.0 KB Created: 2021-06-25 18:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86dae6271da814f381da7d3cbfdf3223 SHA-1: 9e012e77de657f0124e53a989a0d58fccdd313f9 SHA-256: 0863d4d60e2e082fbbbbaea4bf2ee78bdb483e2bb5b11d599c198ce0eb286d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on domains identified as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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 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 http://shinies.ru/img/lib/file/14254238593.pdf
    • https://ckmusicdesign.nl/userfiles/file/xegifinibolesitax.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab045856291---lugunagelebo.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/21bc6ed284096a97de2c8dd2db4d79df/30297440003.pdf
    • http://ttmplus.com/userfiles/files/wifomexorizu.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8460bb12a838ecfcc7371c203b158721/nugerofopilebovatuseravoj.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ccc2b706d9119382c5a53cfb593ef874/99623721685.pdf
    • http://folientastaturen.pl/_data/file/97732528913.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4edd46745d---50143133529.pdf
    • http://lyshiying.com/d/files/33527578187.pdf
    • https://ajur.rest/uploads/userfiles/file/437019873.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4c8a7d7a3f3e07e1c707d0e0dc790f70/92316506351.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db172635b177f6f744fd669e51fd8c2c/zedavinoxuxinopogezidirug.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb0ddd27d---75462094072.pdf
    • http://alphasigmaoverseas.com/userfiles/file/vemododemigumuribusa.pdf
    • http://spreewaldatelier.de/img/editor/file/10256580773.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0b921e48---reroserimumuwilaganevuxo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8f91226f---kagal.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9bc51e205---mopivupoxikadefu.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/a544269a130a7e3fad1f61f1afdda2c1/riduleb.pdf
    • http://apluskleaning.com/admin/images/file/tuxugelal.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b4ecc1cd---ratuvo.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a2d9bc2f23088708b3c1d8f66ee7dc26/88998809176.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4d98983e8baaf6fadc39ab9195aee424/31331984223.pdf
    • https://aspaeng.com/files/image/files/91739656731.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stories+to+read+in+english+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_off0001048d.bin
ec4c23ae7cf41e4ac576d01533169facd7dc8073ef2f9a9f6b18b4d87cd72f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 17716 bytes
font_01_sfnt_off000131bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 16792 bytes
font_02_sfnt_off000149d2.bin
e106e06bd1285827d26d9b2b90600f232b6aa9e2cc15d08073e66b31882d8ba2
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D2 10852 bytes