Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f752f67fd04b15…

MALICIOUS

PDF

99.3 KB Created: 2021-09-18 10:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15bc50a489121c9742fc99711e8d29a8 SHA-1: 9b51ca0105ff8ac5408e6315490bc13889ad7036 SHA-256: 43f752f67fd04b158d2e462980ad0927ae6cddb85d7a9ba635e49ec9591300fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning by directing users to malicious sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://prcomponents.com/ckfinder/userfiles/files/29224711227.pdf
    • http://asavn.vn/uploads/userfiles/files/wuzate.pdf
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.pdf
    • http://rigdrilling.org/userfiles/file/89458892824.pdf
    • https://mimpishiosatu.com/contents/files/26548011022.pdf
    • http://podushka.by/files/files/8042662909.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/8107006550.pdf
    • http://lesen-und-schenken.de/userfiles/files/gejilaxarizizu.pdf
    • http://schubert-hh.de/image/file/tejebisupufos.pdf
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/31874164857.pdf
    • http://cokhitienvuong.com/uploads/files/73100115520.pdf
    • https://smartstone.ca/userfiles/files/52646025280.pdf
    • http://pazzo.jp/js/upload/files/12310386505.pdf
    • https://zaragozadenoche.es/upload/files/16584195323.pdf
    • http://moestuinwebshop.nl/userfiles/file/90458626560.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa811f604---libiwu.pdf
    • http://studiopassarotti.it/userfiles/files/voxodapowas.pdf
    • https://samngaimarble.com/html_upload/file/75086425206.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe9cd3f75---xefebulafuriv.pdf
    • http://xpeedon.net/userfiles/file/20210908055945.pdf
    • http://geoscan.it/userfiles/files/letilinuseguvisevis.pdf
    • http://sweed-trans.eu/ckfinder/userfiles/files/kisutapogugutilo.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdf
    • http://underbutter.cz/download/foto/40113298241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fast+and+furious+five+full+movie
    • 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_off00012103.bin
3183204e56f9d831e40bb83aa35dcc8d9f720b27458f248ecb794a6a82b3f668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 17720 bytes
font_01_sfnt_off00014ed0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED0 16792 bytes
font_02_sfnt_off000166e7.bin
35b99ce54cce2b6705604b3258d9d2bf8b7b05d960fdf24b4d240d92033d2c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166E7 10656 bytes

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