Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f502d5a2f54924…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 23:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d61cb4b5686e4ed2adc17b9506447ad SHA-1: c13d6737e063dcd598b3d523e0e33bd2a3c15555 SHA-256: b7f502d5a2f54924e301b3fae8685fdc23b47910365454b042a5024b918ceaae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bipaf.org/2009_home/upload/editor/file/39615207750.pdf
    • https://northwestconvention.cz/data/files/18046313083.pdf
    • http://profil-metall.de/content/uploads/file/48618363061.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136516c0cc29---93321473938.pdf
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/dorudap.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fepolenifosusig.pdf
    • http://aaaexpressheating.com/userfiles/file/kanizadurobezorasotoxoru.pdf
    • http://goref.ru/files/file/19378303882.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/nezizekudedoxuvubafijoli.pdf
    • http://studioassociatoemc.com/userfiles/files/96210234223.pdf
    • http://cpk.by/ckfinder/userfiles/files/93656132967.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134615f726ef---febeburulelov.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/narem.pdf
    • http://universalestetic.com/userfiles/file/zifimefudosexuraribib.pdf
    • http://ventima.ru/userfiles/file/xopixokinegukazef.pdf
    • http://larben.cz/media/images/upload/file/98167331521.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/14/18583419338.pdf
    • https://cultureresortpokhara.com/assets/userfiles/files/nagakivunudunuwoj.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/pesixosatupajulifivib.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5daf077873c939a5625b1d8837491efb/puxadobaxadigezoxuke.pdf
    • https://toocapen.com/files/64841394489.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wonder+woman+2017+yify+torrent
    • 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_off0000bff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 16792 bytes
font_01_sfnt_off0000d80a.bin
9da3bb040b08b4b90af484c3a89b86d5747dffa05e7bf97b59187141c49c0830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 10836 bytes
font_02_sfnt_off0000f142.bin
0253782672c7ad11da11b1fa150aafae74ce8d47018e0c0f7b5b70ba4ea0efe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 17864 bytes

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