Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3aca544e101e3f…

MALICIOUS

PDF

82.2 KB Created: 2021-07-18 19:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 389c135ceb41e72f660b6d30ed474775 SHA-1: addfa279aadec0ffc39eb73997dc3a311e7dce2d SHA-256: 8c3aca544e101e3fb147fe2c364511131b9d02947964583fb47fcb039eb01c15
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious URLs strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://aite-materials.com/upfiles/file/jabiwoxivuwunazuribupif.pdf In PDF document text
    • https://coebmsf.com/userfiles/file/rarab.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/8938029383.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/8509455968.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824459cf297---38164781362.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7s9igq607pl249rskmoi58tm5r/xawuze.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/vejazavidulajibojolivukex.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f963a31d---kizow.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/gonavilibemitoz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf72d63d8---82747905350.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/21932394005.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xixojusuxevopazesuz.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/8550279525.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/budewarofuzulazomadijape.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/folikidepuj.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/vigodavemetusifadazu.pdfIn PDF document text
    • http://gdaniec.com/upload/files/95756377389.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bb56123b---fapitipegunujawewina.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/34081120384.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1d703d3b207a904c6fdd7bb2564d05cb/kezilabevorelitaxanol.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xagegebej.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ij10n592lurs0mdfpg7kqdj29c/mijeliguzipaniduv.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/091fca7536fcd249d27fc5bd8901801d/sugazozimejolore.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f45072250b285c13ba961f6f5e158618/nazufolutikitatoxid.pdfIn PDF document text
    • http://contextuae.com/resimler/files/nokokedorodakazagi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5c3d287393bbe3f6ac50ccfbf557a935/91662880020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1776+by+seagram+pricePDF link annotation
    • 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 17028 bytes
SHA-256: c60e29bd737c81729d8ef574cc3c32cefd1fd1302d7c4a433f54bab0a6bfc7f5
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 10776 bytes
SHA-256: c705f261c484e7025ab013de76187322e2aeba8e43c640b1fb1bc40b192a744e