Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c062b0d64fedb4…

MALICIOUS

PDF

80.0 KB Created: 2021-08-05 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7fdf4c3ba60f1df19b964ea8e8ffc9d SHA-1: eeec0666c58f5112f1f27d74e5d0fc5440c1306b SHA-256: a9c062b0d64fedb447ceffec5369e85af518fc828a651774035785c3948dda28
156 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of many external links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d3fb2fb0---71578003171.pdf
    • http://2440027.ru/upload/file/42386436240.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2p49g4sggd3j0gksdg5n4t4rdc/24936075895.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/imnpa90l00gm7prrog8jdpenru/guwumu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a21628583c0---49000467409.pdf
    • http://orderleesushi.com/uploads/files/jodezegegokej.pdf
    • http://turagent007.ru/userfiles/file/92525888526.pdf
    • https://aduanaldelvalle.mx/userfiles/file/44197691404.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d49c2487db---32343222721.pdf
    • http://alexlunacoach.com/img/editor/file/befigekirafurob.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964fa32f25f---70491327315.pdf
    • http://stolizstekla.ru/userfiles/file/82248917183.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/10948671072.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ff264e8b31e477b3b0caa2cb626fefe6/mevamijifivi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/13800045e57d7acbf9523a327497afa9/gojodujebera.pdf
    • https://blindnow.com/userfiles/file/watumubuxavasixojefiwoso.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd8f8cbac0---17454559450.pdf
    • https://aawyx.com/sites/default/imageuser/file/futojupezegevewon.pdf
    • http://chukgoobok.com/files/fckeditor/file/13295858855.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce52b3c4efd---bikiwusimeviluderagewebir.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/34494ea7035e1ec8cf0ccbadf89798dc/86756846910.pdf
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/mumegekafuk.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/32591647193.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608997c65071e---pabetawutabo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a4c1876a---wujibaju.pdf
    • http://bajajsports.com/userfiles/file/51957567984.pdf
    • http://asbu.net/uploads/FCK_files/file/2663911983.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=passive+voice+exercises+present+simple+and+continuous+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_off0000d35d.bin
4c05957ec5ba338da16d2ea1f12a2e63851f85572392b06f2a817e8693a93332
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 11052 bytes
font_01_sfnt_off0000ed22.bin
737e125ba38c46ad8a9869f58a41a30ccc0a824d34b859f3972b6487e4db73f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16908 bytes
font_02_sfnt_off00011925.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes