Malicious PDF — malware analysis report

Static analysis result for SHA-256 137c57f820bad47a…

MALICIOUS

PDF

76.6 KB Created: 2021-06-28 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba625f27c1a6ac507ed02bd093ccec05 SHA-1: ecf0e60030766f502db006c10e5ea5998d1b7f56 SHA-256: 137c57f820bad47abf36ed6a7bbbf4bb0c0735161e4800b35fd97f2379980329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3bbe0e4c54f0431f8f1f9f13cb8a2150/33155120162.pdf
    • http://xn--eyt274i.com/upload/files/79104181187.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/77e278b7b75e8ee4ff29d64539379cb1/bosapexufiroxasologo.pdf
    • http://bpsstudio.hu/uploads/32803854686.pdf
    • https://alamansyria.com/userfiles/file/37040242084.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1ebe334133621d97c737efcf18790636/54937531422.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a1840e3---24759298169.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f88d2fd9d---22092638995.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff6803636---95473576504.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e483fc6c1a---moxafefixaluporer.pdf
    • https://adepotcustom.com/UploadFiles/file/20210513224455188.pdf
    • http://cymagun.com/userfiles/tonusenolila.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608515fe13862---vekuxasezebulovinewelata.pdf
    • http://jar-ted.pl/file/wiwapeg.pdf
    • http://kwartetproforma.com/userfiles/file/pegujiwupoxiganukowu.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/45ca163c141250aed03855685d3a6cf7/lovixabidivonifabesi.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc73f083d---wufupalero.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b73d234a---87908340447.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7e8de499---94310429296.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297e05066f---12470929102.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1288800dae---83491907617.pdf
    • http://xboxheerlen.nl/userfiles/file/gerakuwuvozuxos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=slendytubbies+3+download+android
    • 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_off0000c34b.bin
5060a54d6072df213fb13b2537e2a713de826490934372ec2c01df66ff388396
pdf-font-stream PDF embedded font (sfnt) at offset 0xC34B 10928 bytes
font_01_sfnt_off0000dcc4.bin
8a6d28e386147ba7a0c406d90a3ce4a8afbc27d84ad6e378098fe1939056fd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 18800 bytes
font_02_sfnt_off00010d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes