Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5aa44c7972f3c4…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 02:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98d72a8e3a47606f2c6c997eb0395820 SHA-1: 0446043d6c3f5873024b9a224e0c80384abb4280 SHA-256: 2f5aa44c7972f3c44e0fbf8eead7be53a2672cce94b681ce163db2a28cbd6675
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=how+to+reset+hisense+tv+without+remote
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a503bdd1df91a0858f36d5d8f4d635b4/gosizonaribezubopojad.pdf
    • http://e68momo.com/shopadmin/upload/files/51989909684.pdf
    • http://saokienviet.com/uploads/image/files/78073293971.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/5177128251.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/dotakuti.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/s8jih3fnjnkp8l0gvrnr6dhmia/vadaxibadekugalofed.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb3383717---beronujelogugij.pdf
    • http://haphadoor.com/upload/files/87961475906.pdf
    • https://blogsma.com/files/natizisididejugelabini.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/02793effb9d3f3c9008c95ac7d2e354d/zizifinitikope.pdf
    • http://domeinbeverdonk.be/assets/files/file/gudovelikatovamat.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46855674135.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/57704199374.pdf
    • https://bdata.vn/upload/files/jakitobe.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lrohgjcn5g74a4dsbqi0m0racp/3343007605.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/he0c3d55rrg42sqrngqh9hlqog/46138209332.pdf
    • https://alnahamgroup.com/userfiles/file/80218563495.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/37505552121.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c419ef3c350---39378492746.pdf
    • https://bocion.com/ckfinder/userfiles/files/vovesuzigowamo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec90d5fee---54105139124.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/36e8476e920d8c44aed2532f19b27832/sedisa.pdf
    • http://hhsmelt.com/upload/files/39186549542.pdf
    • http://designerhouse.ru/upload/files/sikonezisafimugafiripanu.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_off0000ec13.bin
b446ffcd8b34952bbab802cfdb387152e9ca4d099101865c6f173fdf7015b627
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10408 bytes
font_01_sfnt_off0001037b.bin
117151e3e154a3e43d43d6987f022f0422efe4c3978f24cacc0bd231e7eedbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 17104 bytes
font_02_sfnt_off00012f9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 16792 bytes