Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb6691382f2801a…

MALICIOUS

PDF

84.9 KB Created: 2021-07-26 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 216fbb16ae469e78489ec58a4d741e84 SHA-1: c3f138e425df85506cd36b9a1892e547e8a5bc23 SHA-256: 6bb6691382f2801afa3c62146b97421e9d643bf95457fb862b0603890dff35a9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be user redirection rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d24212b06a33ac1100263a0da6296728/vuwafudega.pdf In PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/vemubalavalagapaxezebise.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/fukitedinovopetozopovi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb6a7e554---45630711078.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/25666519016.pdfIn PDF document text
    • http://cl-pub.com/files/files/fupam.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/185da2505dbb12ea02abddedf556caf3/9377079718.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42446700948.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xemokev.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082472ee2265---69990811084.pdfIn PDF document text
    • https://khanikango.in/file/21223609915.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/zurejaxo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709b12c4585---20495413167.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jq35p8advenn1t4sj2j9od8bug/tozodusutevana.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/dosigo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/99e2aa70dfc144e41499b429c266617c/laledez.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8slsm4meolc26ttl3j272kst0/9401451778.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/49940874746.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076342ca7b02---wonekefifidiserojuvowowi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fab8f0e456d52ab6e2602845f3c341f1/bowaxifaranoravudexuzuluv.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pp9ormlh7pj5rrmoanhlh6t1iq/jagowolaxosifawipepe.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/vukolenuv.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8530dfc2e984763cf26e9c7feecc2e2/53334068958.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/679a8a651ad7c6824269c182022be0ef/63443731670.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0fbc0b14---9566106510.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/20584462557.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+dash+2+game+download+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 17820 bytes
SHA-256: 7031efc54a0a086fbe351663da3bb3afa73d497267b066c53f63052fcd818065
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 11104 bytes
SHA-256: 6e578c1503355f1cb9a4f433d7804a4628af7b4ee0ad10fc3f22a0541481af39