Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e3dda0dcf83a4d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 08:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bebf2d72eabe8410e458e2fa71135086 SHA-1: ba933b2a3b1e44ab9b9a3d949483372493d33cf9 SHA-256: f8e3dda0dcf83a4dc44343c24b4cd77f39534d14423771346ccee69c4ade7bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=how+to+take+screenshot+on+note+20+ultra+5g PDF link annotation
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padasitafogilafej.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/64618992141.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ae70a4ec6cba74c5b9b142b1135a83d4/98359433244.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/soxuzisizamozokebisegag.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/40198460093.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/vudodirexenaterinivolos.pdfIn PDF document text
    • http://chapelguild.com/images/usr/zakigezojonuvo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/25156273313.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/wurafetejinapatipo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8d7e03fccb57a3c046b219ee3dacdee6/56879611626.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/16742093042.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/66951404073.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/55066614907.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/63243954188.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682ead63bb---muxetenifapop.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/jufiwajeluruv.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/24237637353.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/67042585883.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/37181426277.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/lekol.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2825940482.pdfIn PDF document text
    • http://zenhowell.com/upload/file/fuwexowosebonob.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132299c78af7---xajajumakizowo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/26949527596.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/79364407900.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 15524 bytes
SHA-256: f6c13a006f921c4e3937edff4d1e2b3d29297018da1d7d12d0e112dc4c722822
font_01_sfnt_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 11064 bytes
SHA-256: cfa694214a7d11376b3906ec6a9bc6da743063f982024690ecc1bdd6d921a461
font_02_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1