Malicious PDF — malware analysis report

Static analysis result for SHA-256 6240aaeb7fdf1413…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 706f20170077094e4e804cfe34fe6d96 SHA-1: b11f6920108c0ba2c523c99547a7b597971c34a2 SHA-256: 6240aaeb7fdf1413599a37c60253a38597c09f5f478e8290b01d0c22b3550ede
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=wheat+dosa+varieties
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/29277116453.pdf
    • https://atamergranit.com/userfiles/file/farututenitabekajunivoxa.pdf
    • https://gsacademy.ge/uploads/files/guzovetorujari.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/non2njqua37e167oldbd5cap28/tafukad.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/14128899016.pdf
    • https://luckyfood.itweald.com/uploads/files/6143d3d33e034.pdf
    • https://infoenergie-loire.org/userfiles/file/55383777239.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f6d0e71abe05a4f68bc905101ddb2514/67696484136.pdf
    • http://tykhchem.com/upload/files/60754034586.pdf
    • http://potya.com/66628537334.pdf
    • http://zgic.ru/!upload/files/77571142577.pdf
    • http://www.dean-cpa.com/files/adminpic/file/40533239056.pdf
    • http://chaukitchen.com/uploads/files/5379728729.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4d8e0082fe0e5e629ea83b0cfe3e8043/75083390988.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e18058aadd59d0bc66ee5eb04a7983d/73447141831.pdf
    • https://mauspro.net/upload/files/gitilafaponos.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77128154042.pdf
    • https://vandolderskb.com/images/usr/33425528545.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/638a7325555f5a6111922da5d5a8a6a7/83437707273.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5de627487bafe12932388fd66548a5c9/pizajukobap.pdf
    • http://tuderprogettazione.it/userfiles/files/73078484199.pdf
    • https://guruvinodji.com/Userfiles/file/nusomifudo.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa996f3fa---67590980028.pdf
    • http://vongtaygiay.net/media/ftp/file/8245601599.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_off0000b0f6.bin
1e86cd1a25199d09959a4bb1bab0577a368056dc0c6fb60f141d72e5475d6c00
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 10252 bytes
font_01_sfnt_off0000c832.bin
f445670791bd261b8c91a960ab6a5a5adf6d0ac93e899eae922025c2b929352b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 14856 bytes
font_02_sfnt_off0000ed51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes