Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd1764baa325238…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 16:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc877675733073eeea83ae809a86d598 SHA-1: 0f9c50de1c6e95feb6a319b984cc882c493aa000 SHA-256: afd1764baa3252388d7f8ef5958053ea280de29b94c2bc121cf5c3d5477b9160
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ledseoul.com/userData/board/file/sugupaw.pdf
    • http://mistral-paints.cz/userfiles/files/86027151084.pdf
    • https://halkapsikoloji.com/userfiles/file/26116487460.pdf
    • https://bisnismedsos.com/userfiles/file/14780468582.pdf
    • http://cheniou.handysociality.com/upload/files/fuveregemif.pdf
    • https://fuoriscena.eu/file/52132164875.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614c965f4abd2---86934866421.pdf
    • http://humanitool.ru/userfiles/file/kerozumegoxenuxanejexi.pdf
    • https://bhsbeacon.com/FCKeditor/file/sexelovipuwewuk.pdf
    • http://tianlanip.com/filespath/files/20210909130053.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320bfe29a7e---97357353193.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/tawujaxe.pdf
    • http://toflight.mobi/attachment/ckeditor/files/2dcdf7ba66e1a79657c790b83b4c492d.pdf
    • https://radiosmile.hu/upload/file/65858841442.pdf
    • http://alphanaturehk.com/userfiles/file/nozuwikalatawo.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5d82e335---58481418438.pdf
    • http://whipitleather.com/userfiles/file/kapofuzozovoxolafu.pdf
    • http://getvisa.ru/images/File/fokinujenugonulixirap.pdf
    • https://elminhaj.org/userfiles/file/76837192905.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/jofexu.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/78832421161.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apk+gta+5+verification
    • 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_off0000b224.bin
5e6ea8d38d3d010eb048a0d4cf13e6c9c82c1dc834f2dafe127c96ce762e9518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 17112 bytes
font_01_sfnt_off0000de65.bin
664b8ad43b29658a4f48c825222ca1aa3fbf8e4345e5688279915d0ae6d3e3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10712 bytes
font_02_sfnt_off0000f744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16792 bytes

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