Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f3316f4010407…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 14:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f55bb02dc464bb17a434698e24b85b SHA-1: 154c5818e451c8d15298c782ef250bfc187b185d SHA-256: b15f3316f401040767bff3d9cb9a8054e6bb6b97c0d58c8ba084820d7c659dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links on disposable hosting, coupled with UTM parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=go+sms+pro+free+download
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e9883ae4---49286653178.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/68706314256.pdf
    • https://fond.ru/userfiles/file/83442980604.pdf
    • https://ltes.tw-goods.com/UserFiles/files/76791432808.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/suromuxinimizem.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/gerewuso.pdf
    • http://studiosiciliani.eu/userfiles/files/51877145851.pdf
    • http://joyear.com/ckfinder/userfiles/files/difupizilomufuxojemet.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02c54cc4d---67777364399.pdf
    • http://studiocinti.eu/userfiles/files/geduwazaxesevu.pdf
    • http://jinwoosmc.com/userfiles/file/92711175681.pdf
    • http://js-space.de/userfiles/file/katosixesenibik.pdf
    • http://kmbb.at/userfiles/file/21241299315.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e308ae11b---jagipufonoxaziguxifa.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03cd498915169a05c2657cd9b86a2bd7/64995508066.pdf
    • https://mkserwis.pl/userfiles/file/xewomusinavizatugutufipi.pdf
    • http://pure-chiral.com/upload/files/gobedekoxadowike.pdf
    • http://gorsilawfirm.com/userfiles/file/88223325965.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/16839893918.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/zuvoripotinesedapebu.pdf
    • http://magnumprint.ru/upload/files/meripetizoxugodalowawipuf.pdf
    • http://turinhotelcompany.com/userfiles/files/60668806904.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_off0000e246.bin
1b9af5355e8836dff9c63803390771a56c9ba9a06b3c377a4ca30c169c225f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10592 bytes
font_01_sfnt_off0000fa83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
font_02_sfnt_off00011295.bin
850123894f61d3bad2920038ea542bd37fd7530b72a4be07e63ea87ee377c04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 17668 bytes

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