Malicious PDF — malware analysis report

Static analysis result for SHA-256 931024e178d2593c…

MALICIOUS

PDF

107.8 KB Created: 2021-08-10 12:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c46ab96f2db143d6f6a72a9a60628018 SHA-1: d500e5b76c08e489a28cacd31af5735cba719dba SHA-256: 931024e178d2593c218ea4ae59b54271632fa9a24c8b2db7b565b886daf0fd40
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are the primary indicators of this malicious activity.

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://accidentmatters.com/ckfinder/userfiles/files/rubemiwasipipizabodevukon.pdf
    • https://ludifrance.fr/userfiles/file/62162757224.pdf
    • http://fantalife.nl/userfiles/file/lugarorafemojiwarodup.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69150b06c---31637664893.pdf
    • http://brkvinc.com/userfiles/file/siwilenowesurelilukete.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/dazabinikaxukutibewalod.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43613e79ff---zulakevalofumoxu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160771d0a6cfeb---48043315467.pdf
    • http://eaas-journal.org/survey/userfiles/files/6017053224.pdf
    • http://dribblebar.pl/userfiles/file/sazelozerojana.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/rfis4o0uvvdh1k8lbf243f3oc5/memetatojus.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099590baad4b---jimuwividobakilawuvibiv.pdf
    • http://magicdiscoradio.hu/userfiles/file/71831710738.pdf
    • https://agmatbaa.com/upload/files/baxeribasupi.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/77baa70cd4ba619f5bad46cc82f84eda/89896162330.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e3f3ae7b---zekapuxokibikitupiji.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/94246218873.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/57247317802.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed32103012---31064422333.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924d4ca5824---leveletevafadiz.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9d637982---sozuvofevenaxib.pdf
    • http://mai-colle.jp/userfiles/file/64695401389.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d6442408ad7---bijeravar.pdf
    • http://mim2010.ru/userfiles/file/vavikonupezepusese.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kinobody+aggressive+fat+loss+macros
    • 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_off00014035.bin
3443def49f8a851329d4a5f30991a45a44a3141b7bdaf5cb9f409588323ad116
pdf-font-stream PDF embedded font (sfnt) at offset 0x14035 17888 bytes
font_01_sfnt_off00016f74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F74 16792 bytes
font_02_sfnt_off0001878b.bin
a3a07fdc31d0b359c3e65a189cd092b3ebe789c9a1ceda1da384d1a05a5984c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1878B 11132 bytes