Malicious PDF — malware analysis report

Static analysis result for SHA-256 256a8f34f50b04c0…

MALICIOUS

PDF

93.4 KB Created: 2021-08-16 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81ba030aba53b3b5f0d98e7679d143c0 SHA-1: acae4ca6b05408c23f8a56a6054656372d4dd4c6 SHA-256: 256a8f34f50b04c02d7daeeecbb7af4bfefdf56c5e3c4d8df24ef9c3a423a23c
156 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites, likely intended to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing and trojan activity. The presence of a link farm on disposable hosting further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://drafthe.ru/uplcv?utm_term=us+navy+sm%26r+codes
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i2inakjvkd95bepk07tspubiq0/12238604697.pdf
    • http://myconnect-thailand.com/image/upload/File/niwifefefoxawixo.pdf
    • https://megalightgroup.lv/uploads/files/75449646369.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ripb5es83p932ef82l42go7sqd/21920809419.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/002c902af47e96a292842932dce0296e/nodumezefo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ea9056544095dbc65d8d9e8e175e96d7/tevisilid.pdf
    • http://geometracosentino.com/userfiles/files/xugapupelufufigek.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/284686d31925e51d62f515aefd090d70/wedidiwuwarutujeped.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hp28311itj1ncj7iovjevs5mkm/64501936652.pdf
    • http://slsnn.ru/content/file/18920804520.pdf
    • http://hanhthien.net/uploads/file/31507468756.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a7780194fe4344a9d2c501a097603a71/18221014366.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed87c4c0c9b---436006569.pdf
    • http://bindashnews.com/userfiles/file/51765383389.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160864d3dd680e---sedibisupoluveda.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2vfm73ku04s4io1hl4ip9agfv4/89610219401.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91afb02198---73678909670.pdf
    • https://stef-nancy.fr/upload/document/relalunit.pdf
    • http://daindnc.com/fckeditor/userfiles/file/13575948130.pdf
    • http://homeopathyhk.com/files/guravemesedaxonurugifemi.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3c83a3afee11a2bd6e23a7120f199943/5473475173.pdf
    • https://adci.vn/data/upload/file/jufonudozibowuzi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/06e7458755fcc12e03db1243bdb334f9/wisud.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5oio9fgkrqenf6lhn3ln0rftbl/10763094915.pdf
    • https://mkontakt.pl/dat//file/vajifivokofumulojujofeg.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cac1a76c---27418452283.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_off00010a1d.bin
207218b418ae1cb2b16ff6ee07a1d6ed2c9bc2c3ed7742e89f219edd9e9a3735
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 9868 bytes
font_01_sfnt_off00011fc2.bin
2b02b404bed671ef1ca5a1ed617fd54a8393dbde1fd91ec30bd659af9ed00fc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 17624 bytes
font_02_sfnt_off00014e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 16792 bytes