Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39fc5ee3f887c2f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 04:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f8d07c1e53ba08122eaccfd10c831c5f SHA-1: 16382675e04742e78b10483faa4fe89d8bef0820 SHA-256: f39fc5ee3f887c2f6d303f8a0bf8d7d65cd1fa8ea9fab9804bb81abf94e0dbea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links to external PDFs hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic further support the conclusion that this document is intended to deceive users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/e60kef39fm0vq3oo27m724q00s/rejagozen.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/jopuremazos.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/mexuf.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160f35168b3ce6---96014091705.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/59272970301.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/dupuwapemimeforudaduve.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pdv016rkq0sbmaej0q6bv4dq95/46281181332.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/rajozus.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tunuxon.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/64451617455.pdfIn PDF document text
    • http://asustainable.com/global/file/24590864495.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gopekugaxexuzexe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e232dc9a5---kisutomolijijifo.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/viregafogod.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/xegogogo.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/81987085227.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rizotibegirepodepel.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mokanisodositukurogitiwap.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/72178804511.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/bijolomotiv.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21071916503736873014kc2.pdfIn PDF document text
    • https://activepymes.com/pub/file/rigegidulu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/79610880870.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/xajotavoruwasis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=civil+and+criminal+law+of+defamation+pdfPDF 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 10796 bytes
SHA-256: 45de11129f29e9b5098ebd779ccdf658abbb98834ad7ef558ff148e8ece1cd52
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 19876 bytes
SHA-256: 700c58946121d1407110f23c663298bb62fc3424b891e1358499e0246ff734c9
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1