Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc005e8a5c66480…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 14:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c146a6e91a9942af7898fa0a827f1a95 SHA-1: 31e02262dc11ad682888af75b869b74792b0e2d1 SHA-256: 3cc005e8a5c6648027c42daa58951bde05d74faddd241b3c622c5c7dc36c9ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, as indicated by the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=positive+and+negative+number+line+worksheet PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7db682f2fe57579d01c60d99719d3397/vegevavop.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/kajulosuvepira.pdfIn PDF document text
    • http://zzquansu.cn/d/files/perebeduginolizugobi.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/790271f6877173539b241ea16c5d472c/pajilosilarifegesidewale.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/14dd2b5e666128a3e36c04c071034e53/66475366805.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/8995028967.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/94812491226.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f98f5ce133---volokiwobez.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/88686262656705f01c977c9a7c3a2cd5/zosobuwafaloligowifixisu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b18a7501e197654e2e2ac58d34a0ed46/jipejijowuvufolotolu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c64ce90124---zukonusopadiwunosazi.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/o39gjl3sro7qpfhsa3ehh4rng6/wulokutoseg.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d980f5b5ac---gawunefunorigivowix.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gixod.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a6de14863ed0b38b4b4faba04af2c337/18216719735.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/63512842690.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/69328241574.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ei8k9rp0en7q8s05pbjtflnks1/bexukijuxaforugamavovabus.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/77743013914.pdfIn PDF document text
    • http://www.bandungmesin.com/file/80014881439.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/dosavalapani.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fphln25r9h2rg017p3avrptk16/volodukugofumubaketulosuw.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881d3294629---72869131284.pdfIn PDF document text
    • http://beiks.info/public/file/44330075702.pdfIn PDF document text
    • 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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 11180 bytes
SHA-256: ee0478437b509c3dd2913eec1eba42e85d9e856b7f223711e7330133877864f4
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16492 bytes
SHA-256: 1b232f021e6df6cf03f641f046cc6800ae0077928a120cba62099a78ca628220
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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