Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d573cebb18f09d…

MALICIOUS

PDF

93.2 KB Created: 2021-08-11 01:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4753e3e660961810605794b0364f319 SHA-1: 27f4de53931e1b059a244aaa6a1d2f1f7bc1cbc9 SHA-256: f3d573cebb18f09d9e75fef142c2488ce49e93c7542b462b144834b35a4e9ab2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://ankamet.com/userfiles/file/jikeg.pdf
    • http://rcsiprojectracker.com/userfiles/files/22303566022.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74921c8336---95372442852.pdf
    • http://splogservice.ru/content/file/42755513742.pdf
    • https://rh4-h1tapi-turbo.com/contents//files/61142891297.pdf
    • https://griby.biz/ckfinder/userfiles/files/58832502582.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/90b177835fdc621c2bd198607fbd1136/puxozarosonisatusijofik.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1c7aa932---zajatinivevapebej.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/715b8f1cbf6ba0bf974952a43623021f/7968746227.pdf
    • http://adance0112.com/upfile/editor/file/gelizizagezufeku.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d740938b239---8247381068.pdf
    • https://agatanorek.com/files/file/wotekorotipivesek.pdf
    • http://lamorenj.com/userfiles/files/tivefuxekowinebet.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/13562564359.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5a8a4838---80124087611.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/e233a4f977e866fcbfdf01f2f2b8a257/98949471689.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfad20g0fme8bq2qe9bnrba7kb/najevagajifakok.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sfkc5m7bn3e4bljdhnbme3j7od/36328448720.pdf
    • http://laclonghotel.vn/upload/files/kerugumusifirobizojuzevi.pdf
    • https://kultmotor.hu/images/files/dopojosuwuz.pdf
    • http://duepassidalcentro.it/userfiles/files/jexinubeparux.pdf
    • http://mini-garden.ru/userfiles/file/30936963199.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/15319361275.pdf
    • http://kmbb.at/userfiles/file/3034477189.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=juegos+de+destreza+mental+en+linea+gratis
    • 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_off00010097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16792 bytes
font_01_sfnt_off000118a9.bin
425d6fb56195ea2ba1aaef43b58f9388973affe84cc0100a1300263f4d7f0d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 20536 bytes
font_02_sfnt_off00014bca.bin
78b88704fe8bfc0e1f75f70dd1139c2c31113ba36f40c9f8474cc8b8ce449224
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCA 10740 bytes