Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d730320535dec43…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 425d43e619ac07872f280c84031292fa SHA-1: fa8d7417def182f313c12e738bdd3b5d4da4e5ad SHA-256: 8d730320535dec436406ec43e277560b5fbaf8a980fd640413fb9b138fce0924
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a spearphishing attachment vector. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=government+maths+book+for+class+6
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/09b3a82d0b9adcec03829c94bdb0327a/batizumodewuvajekef.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e5692a00c94ea432c842c01a3c0ea82c/55742196087.pdf
    • http://bawaconstructions.com/editorData/file/lagesanoxuluzuviwagafalom.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8b7e8f2bbd---65232281148.pdf
    • http://4reality.cz/userfiles/files/88448034719.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baca8d38cf---87829826116.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/sinaxarilekuliditeno.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99a6dbc0b---69160243166.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8683toq76oka1sk7hbnmn9kdv3/13187263030.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c252320d6ef---wizotaro.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/93e6bd377243beff9146753d286036d6/nizisovipijujefukemidub.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/matomakafulozetewiweni.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/64179251462.pdf
    • https://aronabritcan.com/userfiles/file/76144153241.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/46b31c47a7f874e9a734613f12b9bfd4/vibisoxinenisozisujika.pdf
    • http://macphersonproperties.com/clients/876251/File/liwamiso.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609306da22794---97588592842.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/c381mahk6qg802v0030jj3s7v5/fanixotetusakitaginiwe.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/82437439047.pdf
    • http://chokmanee.com/userfiles/file/lapekajakipozew.pdf
    • http://curry-box-deluxe.de/userfiles/file/vegelakegodamomitisumezul.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/201e8d176970fd0a607520af231a23f2/subusovofobugu.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/gawobedudesubuwozir.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/abe157b67606b899a7a50cd470c6e676/15437385704.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd62d59a2---sigokiwelase.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0d368574---5418728610.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079eaec6766e---13466835385.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_off0000edd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
font_01_sfnt_off000105eb.bin
c0a5cd58269bf4b86a292274164d9e91025379862b494417beb9351f91419783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 11012 bytes
font_02_sfnt_off00011f6f.bin
d42c76b545a00571a7f2a7e7acd023dfe3e8b069956adf6c46df44e7607d9669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 16844 bytes

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