Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3a728e387074af…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 09:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e5f5ef8102aff44083f9a270c0c374 SHA-1: aa516058465dca1daa695f4acccdc4b01d353ddd SHA-256: 0d3a728e387074af8e4a39e816283e24a6e6cb254261aeef65097988c7c1d541
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=neon+art+photo+editor+mod+apk
    • http://tercovci.cz/files/file/lotumazotaso.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f93cb290a---maxifiwelolad.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/18se91il1uc84f2lvrqk26bhd0/11126977677.pdf
    • http://www.kickcommerce.com/userfiles/file/11640974287.pdf
    • http://hamdannepal.com/userfiles/file/13241612422.pdf
    • https://csodamalom.hu/files/files/49950313964.pdf
    • http://alajwakh.com/uploaded_files/userfiles/files/1976851056.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/43622351289.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614791619c07b---gulupirugelal.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/63959998823.pdf
    • https://superpackeg.com/userfiles/file/73696132012.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/31607154057.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b26bb9c1---91576341464.pdf
    • http://studiolegalebisantis.it/userfiles/files/53164221025.pdf
    • http://maybaobidinhdinh.com/upload/files/jumojoralu.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/15797148811.pdf
    • http://emailreceptionist.net/userfiles/file/jabowukoxudujupiwulemit.pdf
    • http://tdjl.com/uploadfile/file///2021090607282847.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/pukozojonijiwefojowexez.pdf
    • http://meubelenindex.nl/images/uploads/mupafutaranuromawiv.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_off0000d403.bin
a3894bc70de5583da05736f5460d4a5fc020e62624e5a5f407ac6bcda33076b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 10512 bytes
font_01_sfnt_off0000ebaf.bin
d656cdd9a6c2b800f790e71e10b38b36eefb55ac910150766b70e032f5db6bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 17496 bytes
font_02_sfnt_off00011961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16792 bytes

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