Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7438695ffa7f7b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 19:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2d85bb9aefc471bde990603312d46c4 SHA-1: 7a8d908bf4f9bef8859d2030e023ee8c7bb8c1f1 SHA-256: 3c7438695ffa7f7b157ca66f0fc9961f7346a0abb5f52c4c249f58bbfee19e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=chrome+plugin+save+page+as+pdf PDF link annotation
    • http://alwaditrading.com/userfiles/files/41794363340.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/lomukur.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nubejavezorebavodubewof.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/jonumepudelewafurug.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/72056717397.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210911011802.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/kanawalefugowazuba.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/95327699320.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/35176741640.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/47536218906.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/lejibapusuvowamo.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19489858571.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/40e5804010e039148933bda7338bcf15/nikazorusuge.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/mevelatatadanisi.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/sexejonoximaxogorem.pdfIn PDF document text
    • http://belniig.by/public/file/22407397028.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/bilanevome.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/vuvesonokefipikevigi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c343026fde08bdb9ce7b3a667ed79ba7/93572900289.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/78829327928.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eefb83355b8978103394e70ae7b83f19/nufof.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vudaluvi.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/fitufudadosejegavapaguk.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/wemotel.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/38700056466.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/dunubebefozufiweku.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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 11044 bytes
SHA-256: c1f92ede54cfa193eade173e15e4c5b55d1d9860f8e3ea3b40a6e62d49021afa
font_01_sfnt_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 17812 bytes
SHA-256: fd0d18ec0d24c9402b094f8d450de133acfa0b4b338c30c20b2f3abb0b366139

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