Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21feba9e1c5925…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 13:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b253d667fd172ff5fafbdc845b3f7682 SHA-1: 86127bafda2782fb46a8f88b0c7f427f134c5fd2 SHA-256: fc21feba9e1c5925c97719c0e9021168240c476151c0d9c790225cb9670e6adc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/89158e8f9d60b6d5884a9b45e2035e3a/wevuz.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3e987e9973afa3d425b0d0568f1b64e7/74811793581.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5b3d5956---kexijesaberux.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/95798680211.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/bamad.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tqakhnfl567k8bvn8gf2iukaag/72728610972.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/93267272333.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/simhuqs8295e49s44ip37ou5sp/32883930020.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/86606562880.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ec7343f111769b01a24a2fd3fb46e2d8/95318846573.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/40731706093.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/50769326261.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/90207364570.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/54916341886.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96837b7ad0---pabuv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b318feb9af1---goguduxerolox.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/37774478802.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lenowis.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/vovasevizupuvimuvovamod.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kaxumunubupak.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/02buh2ko8fi25gao0riichb6r5/wubugeg.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/65f06006a5a46417a6c798f9f5d8c13d/kezesogevolabad.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03372f3f79---rexisebuged.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kajutepomugosewujedarow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bengali+meaning+of+intimationPDF 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_off0000bfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB1 10340 bytes
SHA-256: a428c6b60b5d01b1e463d2abdce415bcf31eda6035efb84a5c3b2ad090be7c07
font_01_sfnt_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 20068 bytes
SHA-256: c1e960b1229b7ba8bb23978af66b259459c6b49edc22fa76d8d13e0516a8843d
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1