Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d52d66a9de1b59a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 17:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb38999e5fdc69eb3846e58cea58a342 SHA-1: 77b1784effc45ffe2b612dfee8d8c594a761bf71 SHA-256: 7d52d66a9de1b59a0680f294e24f8d438c5681803bcdfb688b9064e2fdd63ffd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting. This indicates the file is likely part of a phishing or spam campaign designed to redirect users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://garglob.ru/uplcv?utm_term=prentice+hall+world+history+student+edition+pdf
    • http://savitaco.com/uploads/images/files/varuligeme.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077272bc527b---42906756143.pdf
    • https://alyosserspneed.com/userfiles/files/10064234457.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/039ba4bd4f00a7c3ed8495fa572a7441/bumekekomepaf.pdf
    • https://susta.vn/userfiles/file/9695748106.pdf
    • https://comtraining.cl/userfiles/files/fusivedesidepudit.pdf
    • https://feng-shuiworld.com/userfiles/file/70864164030.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343804adaf---58363724757.pdf
    • http://canxetaidientu.com/images/file/6071231668.pdf
    • https://beatmuellerfoto.ch/userfiles/files/16970464285.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/724326549.pdf
    • http://hykylalumni.org/userfiles/90012466358.pdf
    • http://atthaya.com/file_media/file_image/file/zobewipapumut.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulanozuzavukediv.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fbb2aef4e60017ef0cad2a3527cb0197/rolefiwunoku.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6868c0c3ac0e7997d6f90a9e0f6222ea/danifim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8723f4024---62041127238.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/vewazezezibumepemoperel.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bf57ef29fae54369f9ff53a0c05880e/95363214306.pdf
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/34549601852.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4742734---2576229725.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/960d18189408ce4f4ab9f68d1aa1b967/13951913340.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hb3ap27qftat68ov3dq3u2o4dlk84fri/84501722330.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000ce72.bin
5137b6296aeb644c971a79b007fa743b48e5055a72fa956cae399f1c4e569a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 17788 bytes
font_01_sfnt_off0000fc73.bin
e0b3eae1cf0d67846393b0aba5baf826e7e672ff448f5ea7d388d9e894ac745a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 11020 bytes
font_02_sfnt_off00011616.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes