Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f93fc3dd0bc444…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 18:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec2d3fbcbd1af0e5fee7d7f872db9437 SHA-1: c103c056c9bc092fbd871f719958af1b2b6bd40e SHA-256: d3f93fc3dd0bc444976d9051603336c564458d6febd4d02efd60a028724ff934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://ymy-tea.tw/upload/files/54523722777.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/14366801600.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mewurazunitomonudedukoxiz.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/6533511547.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5435d91---balewojubusupivelejejoju.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8b9076fd0690c6bc468a6327a3a115fc/59640802622.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/99e84b247617b44f1f7027f155f1e29c/96651526438.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a2eec927---xowexanexivawomek.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/pavafipadelugitabituv.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/469795.pdfIn PDF document text
    • http://apismorava.eu/docs/rabivojopafadumawefip.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613343ec1ee52---71971286907.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/nexozisokum.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigenaroxobi.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/ruzuvekebiminu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/4410594987.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/47ce7723e4beb928d0100e54181f8038/28185062480.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/75657701619.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/68189959654.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/25192863201.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fosunonogolatulitopop.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/51963765746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=black+panther+trailer+downloadPDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 17332 bytes
SHA-256: bb1025afb7650795f324b449a726fbe6a63fee7754d47af6cb7b73401bda2633
font_01_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 10672 bytes
SHA-256: fa0d9c741911f55c647921bfba1ba8daae37b1323b41b07e1a611180f0bd687e