Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18dcc4569d01d4f…

MALICIOUS

PDF

84.1 KB Created: 2021-07-13 15:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 059e181c5c8f8f01c85df272f5f1baa0 SHA-1: d6221e133ef9371887f333ce1e96004390f50e06 SHA-256: f18dcc4569d01d4f2912248a0b0ea8bbb8b81b21e5e4ca4eb9dd28bea3ca2dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160856eaba49b4---wudujaruwi.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae675628c9---60177407946.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/10275576124.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/978ebcb53c705e298a1642974ccc55ac/93802067447.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57c98eb86---94656826086.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dozejimonapetibizev.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1ce474a3f04a84207f9845532f706466/mexavikokifad.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/22527705977.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe8717bd16---91294480820.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/minezosivatedurijitekiji.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/pakovokifaderozuzuxuke.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/18dcd01ed285e7d42fa16ea1ba190be7/boterepavilapaxovi.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/43165496509.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/59620428246.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/pevoxejebaviruluzexowe.pdfIn PDF document text
    • https://htchninc.com/d/files/senosoxujo.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/79314318721.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/07c96d79ca863a1a0aa5abe77972ec8d/26651257000.pdfIn PDF document text
    • https://jagominum.com/contents//files/66783961689.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/88348591172.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00745f37651867128649c002aea7635e/86026207897.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/pojisemiwabinotamalunurud.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/71187618338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+of+the+following+are+excipients+exceptPDF 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16348 bytes
SHA-256: 543db4dad8efb7d9f90cf776ffafe478cb2dc489da0ba6b4d0c70a076fdda18f
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 10928 bytes
SHA-256: 47cce2e3a781a0888ca0015a2e997393283dbcc67052c1426f25ab03c847fa63
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1