Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66656df9af14701…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 10:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31dc7e4c7ed3dda79f3450dc552c3e25 SHA-1: cb5113e06e7cb621ac0688647e9b8e7560574f57 SHA-256: d66656df9af14701e87a8886cef98472e1f2fcd9b0c48319a694b88309baa56c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the document's structure suggest an attempt to trick users into visiting these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thomasbelldescendants.com/clients/40432/File/55746746455.pdf In PDF document text
    • http://yh-nutri.com/filespath/files/20210826020607.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/75134946513.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7924cd31fc2fb8fcaf837ce7ec52254d/59141054124.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a081ba6c1---tizule.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/14610335563.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/xesoxufetedajujupim.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/70880146720.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nozoxo.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/vapowalufepowojo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc6006827---32108442466.pdfIn PDF document text
    • http://iworking.vn/uploads/files/8999118968.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/62452477135.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d42581faf---97644129917.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52df9d11f1---sisojuka.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/88482002096.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/73984307042.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/51777780371.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/32975868731.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/69228747443.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zifaso.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d4f1b2609---guzosulakawiniri.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/32ko17nbsnis845i3d8etbadn3/57061417576.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/29bca9f4d22eae891da403009aff905f/dogidunokosogomevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+apocalypto+online+with+english+subtitles+123moviesPDF 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 11564 bytes
SHA-256: 0f1ad7b2895a75250c9c1ac82c043a546ce28da39b76e71508b1f884ddea4e3d
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 18316 bytes
SHA-256: 0cb813dbece6fcebc213a8fdf8e2eaa34642e282b74d0b47a47203d3690cc494
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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