Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd268991f361eb93…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 02:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6768c0d80de3aaca395a35ddd2396ff3 SHA-1: 78925a42f6fed74893921063cc05bcecc9547efc SHA-256: fd268991f361eb93e3f40b5a15083e2bcae3ac4b0f56272671dfdcab436dcb80
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly point to malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=pdf+file+how+to+edit+text
    • https://circolodelpistone.ch/userfiles/file/82394556187.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8e58b5ce---wekesepuzani.pdf
    • https://watertorens.nluserfiles/file/19587397457.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d7d333221---juzafakafalomopup.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bf05def8---logubokuxewiburinezuzupe.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3c23cb10---30599644955.pdf
    • https://jdlpartnerss.com/userfiles/file/metukupalowup.pdf
    • https://liniagdanskzydowo.pl/files/kizudotinosovaredi.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/wumagosor.pdf
    • http://jjinline.org/file_upload/file/31347280232.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469f9d0825---vozuvotevilok.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385ec50ad1---6465107119.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/729a22c7e5d0d9f8b1d9cf96e86c6680/26070858206.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160820a26737e0---75880261990.pdf
    • http://www.ecvbrass.ch/user/web/file/nufirafezuwidi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411ac36d1f---63263472144.pdf
    • http://bisenzia.it/userfiles/files/32710989797.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077eabea3094---46502041110.pdf
    • http://myucmas.com/userfiles/file/zosumajizojijujedika.pdf
    • http://hydrem.ru/images/file/wiwazowodejan.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d07bae535a9b6c97732dc969f2120201/nimopatobuvedezewaxes.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c41fefb03---xinirawamozizalunado.pdf
    • http://alexhoffordphotography.com/temp/files/file/sutisideposubutiw.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f72a66a2ecc481ac4adee682f670a98c/voliruk.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_off0000e94f.bin
2adcea856bc446ee2b20b202ae5fcbd0bbf31d4e8af5ed90a8e4faef2c488b72
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 10104 bytes
font_01_sfnt_off0000fffd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 16792 bytes
font_02_sfnt_off0001180f.bin
66ec6e1e5b3612126a65d4521c9ad0ced843e51c922b19bc3d042107c9e326e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16924 bytes