Malicious PDF — malware analysis report

Static analysis result for SHA-256 d914deeacd1aa44f…

MALICIOUS

PDF

76.0 KB Created: 2021-08-25 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3956600a9c92e3d00aa2585c5acbad2 SHA-1: 07c8d215aba2b4e00987ad3d39cb046631425445 SHA-256: d914deeacd1aa44f691af3baf2de45dd3686ad639b68fdc1031681bb89921fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=schaum%27s+outline+of+mathematical+methods+for+business+and+economics+pdf PDF link annotation
    • https://wecareprogram.org/images/file/tuludirili.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f2e4e7d38d2115b492b320ad23146f56/61983524864.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vakoduluwaxazizeli.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xavede.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lonovemotorapenubixovuz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xezemusivisakifuwarid.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/33442778131.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9709d56906e0baec574b2dfc9247b5fe/80021675584.pdfIn PDF document text
    • http://anm-av.de/uploads/files/15297033212.pdfIn PDF document text
    • http://netflor.pl/upload/File/24313667668.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/24261967662.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/941i1ul1ntpu7dpb867rk6kmde/napozevu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba78491d9---fekoxudomogilasesinunafum.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba25aa0f9---rugutawopufomunakejonoba.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/47195682354.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/suxozov.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55551583292.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c0160357---23699518425.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/05422ccb891de64861c9749e75f0f759/24205450743.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/wuneduz.pdfIn PDF document text
    • http://sns.hu/_user/file/munosopix.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210613184910757.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/bozumugi.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_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 15896 bytes
SHA-256: 34f325574d1fb995ced735af648e953b4a43552f8238d97dc4cff34e142767bd
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 11232 bytes
SHA-256: 927a11a206527a397e5cb0978457e871d3fd2e866634ae5b0063fab9c06834f9

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