Malicious PDF — malware analysis report

Static analysis result for SHA-256 761376acd98fed89…

MALICIOUS

PDF

65.1 KB Created: 2021-09-27 07:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d5d701363ad8e3c7435d0913f826a63 SHA-1: 7dda15450cdf9bec69dd837c364d53aec4995b44 SHA-256: 761376acd98fed8955918f4d4aca036203b734827bda05b94c195a123118ae64
124 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the ClamAV signature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=best+tennis+game+on+android
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bqvmjgbmni5j1v37rr30linhnv/8725122082.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7isee5grovmc5jqe28fr672vae/tonejejedowadubadib.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/92729889422.pdf
    • http://realcomfort.ru/content/upload/file/40789445313.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1213ba8d---pafuxovotovak.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/66974148167.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8b1a2830ccd443a076ad530c8f958d7/2845486770.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/womufefowimevemu.pdf
    • http://fmi.lu/userfiles/files/fixogikenewajerezomelizo.pdf
    • https://aviseco.ro/userfiles/file/92631194413.pdf
    • http://another-partner.morefriendship.com/upload/files/50205731128.pdf
    • https://cmoretv.com/userfiles/231249882.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/rakadotijajaxeva.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/wanupanisolifufoga.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/13885806958.pdf
    • http://chinastom.ru/userfiles/file/44468522616.pdf
    • http://trieuduong.com/images/Download/4371052839.pdf
    • https://ibeguiristain.com/userfiles/files/rixikavagubufaso.pdf
    • http://3e3i.com/UserFiles/file///54999883256.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd3e2f16e9---53836840706.pdf
    • http://sanarina.de/ckfinder/userfiles/files/31036777680.pdf
    • http://www.lbtfilm.com/uploads/files/nasitugowo.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba758f1687---juvetifitixopogik.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 16792 bytes
font_01_sfnt_off0000ca7f.bin
7b02449ebbb6d24d5d046847f24f711ebd082c0485de1dea8a932a22d3c51c94
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 16108 bytes