Malicious PDF — malware analysis report

Static analysis result for SHA-256 5462e05b323093dd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 18:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 808cdf1ba3918da705e3ce27600b0ee0 SHA-1: d76db22a77a6c71b41fa6099b24093c27894b025 SHA-256: 5462e05b323093dde9bfe5f9030f4461b8cc314715464de5d54e54f55c94ae49
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs confirm a link-farming and potential distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bouwbedrijfbouwheer.nl/userfiles/file/volunirowulexenejolig.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j4g6bdmi2f4pc19f5r2lkpsui7/66507401262.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5a296e1f6757bbf02bfc4b8f3672e3cd/26889404429.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/gitulezujebelizati.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/leau5btftv5hpg7fru5ku2vra4/79677300089.pdf
    • http://dajuicebarus.com/uploads/files/79242055118.pdf
    • https://efckrakow.pl/userfiles/file/livuzekozavifimotiv.pdf
    • https://acavacecio.it/userfiles/files/kiwemokafesa.pdf
    • http://msslink.ru/userfiles/files/jozon.pdf
    • https://borgopitti.it/userfiles/file/rakogadeda.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/696202b35f3b4d84c742501f0f4ae31f/vapeseguvolurumegexumaref.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0653721d4d305094a59044dbfdc8718c/bopokojokawefem.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608587b60f0f6---fopugasakiru.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161041de1d2f7a---ravivuvovawakudimodesuwi.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hhqam08qu9plbvml9up6e9nmmv/kivepudilisin.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11a3c3b7caa18abc49ec0879b539a6fb/62410683782.pdf
    • http://indecomavo.pl/inc/tuxepiwiba.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e252063425da1bc5cbf9c6e077e901ce/busagamoduvoxopewogagidaf.pdf
    • https://lodoshosting.com/calisma2/files/uploads/dukusinusifulafeg.pdf
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/16273358879.pdf
    • https://riwg.in/userfiles/file/tojakamulenaj.pdf
    • https://xo-sound.ru/userfiles/file/xuvupogusazakezus.pdf
    • http://brukbet.com/user_images/file/10549166479.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=homeopathic+pdf+book+download
    • 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_off0000cb7b.bin
7e92f0a1602ac97976dfbac1a46c9589fd86a79df8b2ac1eceec28549ed7383a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10924 bytes
font_01_sfnt_off0000e45c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
font_02_sfnt_off0000fc6e.bin
56c2e404e18d60f3ef45cd2b510f9b4c584221f768b093ad4fa687adff125d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 18740 bytes