Malicious PDF — malware analysis report

Static analysis result for SHA-256 093481b5721aab56…

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 18:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34eede7f4cf739b1a42bf7acc1edf32e SHA-1: 82f6a35b2fa6ee609144158de22c996a10330239 SHA-256: 093481b5721aab561470dcd1648f3e9fb294b5e20d081eed7b877f7dae82fa83
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://lukasikgroup.pl/Image/files/68933739455.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/74720475956.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/97131896362.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7f3937053d181f01c30c652386ae101/74667988729.pdf
    • http://shesob.com/file/files/3518083574.pdf
    • http://capesociety.ca/uploads/files/kuxoretudufit.pdf
    • https://prospr.fr/ckfinder/userfiles/files/xobelunupekunaxor.pdf
    • http://aucontecnologia.com/userfiles/files/zusux.pdf
    • https://bosgo.mn/uploads/files/sekufulotijupopusewetaz.pdf
    • http://jubileejec.com/userfiles/files/46744276505.pdf
    • http://detskypohar.cz/upload/file/wisetuxivimo.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_EEE4184B0ED8B898.pdf
    • http://drivingtesttips.ie/fckeditor/userfiles/file/14111785063.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c732b257c6---65475401317.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/39699159981.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fedowipago.pdf
    • http://firsttimehomebuyerstudy.com/images/file/35378413146.pdf
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdf
    • https://27061010.com/uploads/files/202109041321514461.pdf
    • http://top1np.com/ckfinder/userfiles/files/rixepiruriwuza.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e936959f5---62521806523.pdf
    • http://kavtas.com/images_upload/files/tosebenokase.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=standard+loft+and+lie+for+irons
    • 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_off0000b447.bin
b29b7f50780f18bd0e205e2f832707e81f09a3922af10d30764ff03f984a063a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 10424 bytes
font_01_sfnt_off0000cbf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 16792 bytes
font_02_sfnt_off0000e406.bin
75a8af17bb2bb981402d74e0b00f10f1bbfee376604c466ec8400e8b8bbb71ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16140 bytes

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