Malicious PDF — malware analysis report

Static analysis result for SHA-256 b025983a1af8298e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 13:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4508e76728f4728a0da1ec1a3da2cb95 SHA-1: 840615b63956f82752c0230a41397c0e15ab31cb SHA-256: b025983a1af8298e0dcc52e4b8ce2a7411148e19fed17296c081a1db5aea9847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the true destination. The presence of URLs pointing to compromised CMS uploads and disposable hosting further indicates a phishing or malicious download attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=download+aplikasi+lightroom+full+preset PDF link annotation
    • https://by-express.com/upfiles/editor/files/96234173533.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/54315236502.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/nozidemagafirufisut.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/binepetitezewoniza.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/zonit.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5af5ce01b---joverogukasufabare.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_BBE6716F728A360B.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/jevidof.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/zikuto.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/lilazidivadomageben.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/24959500737.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/1006513308.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/dikemunuvonugutuxe.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/19739212848.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/53281029253.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tfbke32mhro45f14aum702khq3/93488855721.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/49973664621.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/koxokavumat.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fawajebisajevamo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jugusozusokokanulijozixe.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/sugujata.pdfIn PDF document text
    • https://projetovm.com/uploads/files/94058485119.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8f538a8ade7142e566ea9300e4b10857/56290186033.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/napozuxepezajalijafesar.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400e812f0a9---92577251046.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/gunovujosumowel.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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 17900 bytes
SHA-256: 2de035a753a5950eef249484541f7d8f3812f8b79fe57d62b5a50f7ef6d348b5
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 11224 bytes
SHA-256: 53982e0fe48511d2badb4b450336997106f7b2294471f09e53fd95fcc04b1e53

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