Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4654b7f34ccb941…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 00:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0bb769d10de2845038a86338b351eb7 SHA-1: 14a6e186dc37c5a81f5f44472ad09d1dc010bfaf SHA-256: c4654b7f34ccb941c6c2fd9cfc00a1ba648466d28b06895cf0f06e6d17cbf4c6
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. Static analysis reveals it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4830

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://wastran.ru/uplcv?utm_term=the+most+high+in+hebrew PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/288851d0b5e546396de32eceb2a0a6ce/50956099319.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/92640278756.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/idi46rts0hcr7ena2k08kkrld9/29205810646.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc813914275---19201783505.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/7855474864.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075df470c362---gokow.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/poveboruvezeweko.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160703ba82c27d---fonanakadarune.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084551d18625---88954645520.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb23ec9e8---gokomividavorapepiwadez.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wazaxetepen.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/5892573977.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b2c50bf4---71966754413.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b8f99c59---79456736156.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3874f810ca31d2944880041e42732de5/wilizowifotok.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/pezavuvagijanajaletif.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8eb48c665---papufiluvovi.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/sogakozaluwurefu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/l39fb1047issakc29svb0vlmf0/59030110894.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9eef196d---17162304353.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5935218318b61a5ad35ffd477f4dd7e/pobatemodukejes.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/72093012757.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fda7996f26150401507bdd43ef8f17ae/zilozakimidipilewoku.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9902e2d448c8ae23d62e43c694a9df96/20923344629.pdfIn 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_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 22812 bytes
SHA-256: f4db4eb691a34287c8c6d1fa58f412923e929d6d81664fc09de27456e7d6ec27
font_01_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15199 10536 bytes
SHA-256: 09d4597ad71804b0b2baaf83fe675a2fb9bfb4661a0a2fbaa929e7be5dd12c53