Malicious PDF — malware analysis report

Static analysis result for SHA-256 898ce26044eeae27…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 09:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 555569f386c61938af6da1af19c0d2e8 SHA-1: 8439821196554bab7958bd272ae565d09f93a164 SHA-256: 898ce26044eeae272e369a3c61f3c74f5f7cc9d8fccdd24ce5c672f4990dcdef
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, with one URL specifically mentioning 'download cod mw3 free' to entice users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=download+cod+mw3+free
    • http://location-appartement-venise.com/italie_documents/files/18851411495.pdf
    • http://hla.vn/upload/files/begegewasobijibekotixama.pdf
    • https://designsdubaiukfashion.com/userfiles/file/12653729312.pdf
    • http://sevvalturizm.com/rsm/files/jikufakefinez.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/9391022676.pdf
    • http://tarnava.eu/user_images/file/kodures.pdf
    • https://vonia.mikludava.lt/images/files/1837673433.pdf
    • http://purepassion.pl/userfiles/file/velagila.pdf
    • http://www.centrosanmarco.eu/img/news/files/82200176834.pdf
    • http://yugang360.com/upload_fck/file/2021-9-20/20210920072548211508.pdf
    • http://didaconcept.com/admin/fckeditor/file/40835970230.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/xilopobegu.pdf
    • http://humanlitech.com/files/files/29358924786.pdf
    • http://csc025.com/userfiles/file/20210923071237_ekrdkc.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b2c4c46c903da01249eb7772a91a9b71/99481202009.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f42ed40dafb515b07ab7140f9d4b5689/tewimewifezidu.pdf
    • https://eastoncn.housemember.com/uploads/files/95088218116.pdf
    • https://commonwealthsportsawards.com/userfiles/file/21233780548.pdf
    • http://studiozammuner.eu/userfiles/files/verababupavux.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wimomenan.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139570a382c1---34708195337.pdf
    • https://weishinclinic.com/uploads/files/202109241053247080.pdf
    • 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_off0000aed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 16792 bytes
font_01_sfnt_off0000c6ea.bin
3f1f682e644bd67fcbd56f6cf74396c84bd452ffe7ee85ed8d8d5508915bffdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 17460 bytes
font_02_sfnt_off0000f2b8.bin
41f5a690e47f9a1b4869d600c9c6f0d28fb10a9a652d85a333289efd43a08c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10536 bytes

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