Malicious PDF — malware analysis report

Static analysis result for SHA-256 d628729e10780cb2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 16:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c26b3003d953e7ab5697b242a06697c2 SHA-1: e4757dd2f967cf7bd004b88b47b84d19c253e370 SHA-256: d628729e10780cb22e99debd1d79c68e1fd5d10dd260ea4417ddab81641b5d94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple links on compromised CMS uploads and disposable hosting suggests an attempt to obscure the true destination and evade detection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thetuckerfamilyreunion.com/clients/67950/File/madevepisivawa.pdf In PDF document text
    • http://bilcafe.it/userfiles/file/11024108771.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d266e58635---66356715745.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38430601333.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fb6c86969f6c6d921fada97929f857c6/wexenejabafiketitosi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd43c2910---48359235622.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/40236839961.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/vuwuzadorekaxoboganofer.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f2c309e3---seguzojibizajodenigigave.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/95067460063.pdfIn PDF document text
    • https://desco.scp.hr/files/takigawidorob.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/11345149246.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea62d981d6---kirelifaga.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0ac72dc04efa4718b88ca1d8f27a58fa/tutipotegosizope.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/filifugepiz.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5bb16fb3c344d2114ff70dd0eab89bff/vemetosuv.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607092c66665a---10677016516.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/96851663664.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/86514611850.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k3949q5vq13uaij734h85nl00g/vekimaxopefakixutuzafusa.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/wonarariwuxafiz.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/66015572096.pdfIn PDF document text
    • http://ombs.ru/uploads/files/90222074102.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5c513454c---wazuzomobedadobixu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/joterexum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=livro+darcy+ribeiro+o+povo+brasileiro+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 20084 bytes
SHA-256: 3cc330230bd4463f9be0c0fa69ecd35bd222f4c18f42fb44c066b8f471a8e297
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 10688 bytes
SHA-256: 915e508033a2b441f7aeebf38c10b8853095793173d214a617f1110ffc103a64
font_02_sfnt_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1