Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b14964ec67e08c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 01:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a22a33569ed544e3c14c06c5233c5f9 SHA-1: 9124e83b317ce55909fdc1f87172ceb89af8b4c2 SHA-256: 98b14964ec67e08cd784a5deaa664204c57684481f18903302c882a1fffa5432
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://dui-antidote.com/images/userfiles/file/72720069585.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/86dfb4a9b6fec3b76668a9c57921b7e5/81644299217.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b236f37a419---mamukinapipaxukik.pdf
    • http://cloverpark1959.com/clients/51168/File/mevawarijoro.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9071991d00---varesalotowiba.pdf
    • http://dominoliberec.eu/images/file/files/sopajirowagizezujejoron.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rhs6elq8cuhm9s134mmmq14mqv/geratowulanojujilew.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/058e7274d477643228877c72ef4efe01/vufor.pdf
    • https://deniz-sogutma.org/img/userfiles/file/vaxipimoxazipoxiber.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7dce3408---60004665069.pdf
    • http://huucodatlanh.com/userfiles/file/85578221374.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6b8271cfc---mozazobu.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/22592484663.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/0d393bb191e33489134ba916e404df65/19510467190.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef0f76a04---mirubiguwonelipevosu.pdf
    • http://jrmhandling.nl/upload/file/44976350431.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/wisug.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c5daa061---9543283109.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tak4isgk681em2gkule1hreqo3/tumixipisakamimekagibe.pdf
    • https://cornwallstaffagency.com/userfiles/file/gusowavigozosapewexiv.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4877f8b170390cf068b7c8497d80729d/gilasadorijav.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46361a9c3---kolomobikot.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729372ca9be---51750205794.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=forget+opposite+word
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da42.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16252 bytes
font_01_sfnt_off0000f01e.bin
2a37eefbb6224776eda522c1a268c35ebb33cf8f740955092588d70ddf267ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 17112 bytes
font_02_sfnt_off00011c7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16792 bytes
font_03_sfnt_off00013493.bin
a3b61b15ddda50385e92a9acf3850d3cb09e877b6f37ba982338635ced85784a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 10316 bytes