Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a90770f0195d80…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 14:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3256adeba8d896b524bff35ee87751d SHA-1: dcf28635c8b2a8d929779abfdd01310b69db89f2 SHA-256: 94a90770f0195d80eb1bb12ebd0d74e6960aed94dcf9bd7d08d460cc3e2f2917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://globalcenterhotels.com/bot/ckfinder/uf/files/nudizegababolexipedoz.pdf In PDF document text
    • https://liho.cz/UserFiles/File/96920311936.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/45376212873.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/22840180798.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/16787289247.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/30513808230.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad5a08c2c---57886696904.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/85980802502.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/nibajofobadijozijoxopas.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/timumeremivule.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/35245295634.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/78558118466.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aab7b4ae5---84707828483.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/68536806448.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/40829446281.pdfIn PDF document text
    • http://www.ezmoving.com/file/50437737178.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59019400949.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/sotezawigolesitudupi.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/tezenekotebuvixamap.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tesasuvemerikikomojik.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b27afd3c36---xefitovujupolosalo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613af67926dce---degagepem.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/91011101299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+custom+page+sizePDF link annotation
    • 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10872 bytes
SHA-256: cf10f781fe34f351412f842b48663f392b59110a00748949e01820e4d7be8078
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 19352 bytes
SHA-256: c15bfc6c9695e8875f9426fd653ce366b5e4cd8cb812ed6dcb35933981bf4443
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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