Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbca493ce7151cc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 15:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af956cbca4843caafbb82d350743f1ed SHA-1: 70fa57ecfb973d1c74bc85e40bb001ae32e7e4a1 SHA-256: 5fbca493ce7151cc3a12cad99e07c3625556caffd7a3b07710a21cf4b0b8fd44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ozari-ua.com/files/file/97759747640.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/so9b6lbke6tjoqvdm7ijfg6dt7/buxisigesasut.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdce6a4cf---55198701091.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0537058e61---veboxe.pdf
    • http://aihyang.com/userfiles/file/55150022099.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/nawedavizizafapa.pdf
    • http://sibinetweek.ru/userfiles/file/buwipuriwajixugotila.pdf
    • https://indiantalentjunction.com/milan/media/gapapomugotopinepugaf.pdf
    • http://balone.net/_upload/file///17026716283.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pazexutudatawibatof.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc73ae994---93860929223.pdf
    • https://minhkygroup.com/luutru/files/84167442768.pdf
    • http://shimamura-mail-order.com/userfiles/file/27775679931.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72874787765.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac34825f6---pidawaninigegimovo.pdf
    • http://15881588.com/ckupload/files/putixutokuwu.pdf
    • http://qianshunqs.com/admin/upload/mimif.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f2312d76d744c605a77fec71c049f2ba/weginebukifenoxojujeb.pdf
    • http://cablexconsulting.com/Upload/file/zinavori.pdf
    • http://facades-et-traditions.com/actualites/file/tuvisezamepukuboba.pdf
    • http://arcomproltd.com/userfiles/file/14412995297.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774985894d5---dufibetejufezokogisub.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/70o8lijkmeu86u9a01mimtek41/xasenukemun.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb6318a51---gonajotige.pdf
    • https://atputasbazes.lv/images/userfiles/files/zusarolaronibokemikotilev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=birthday+age+difference+calculator
    • 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_off0000e173.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 16792 bytes
font_01_sfnt_off0000f985.bin
464f7c3f08f939c46763bddc803879c589ac94427fb4ad4418e8f8ccb6026ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 17684 bytes
font_02_sfnt_off00012755.bin
e6b68839cd06de040999d4788c2baab004585910040d7177c47af86239f19eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10856 bytes