Malicious PDF — malware analysis report

Static analysis result for SHA-256 93deaeae421d9c45…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ba94ae75ea51c18558c1109750b33f2 SHA-1: d7140481009dbc370759a1f72f117b0a8cb11399 SHA-256: 93deaeae421d9c45af8073c8d4bdd5ecdd644721a522f74d640cdb9270dc7084
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which host PDF files, suggesting a link farm designed to distribute malicious content. The presence of external URIs and the nature of the heuristics indicate that this document is likely part of a phishing or malware distribution campaign, attempting to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e31ee1bace4e868980b448d2009a77db/35849145645.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ad2d473193c819a85aa8e37906660fac/4990546079.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cecf12ac8---vawademosefexi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/91903768530.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/10116130726.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/32403151304.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/xujinikafinoti.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rifisofizebekumadekipolik.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1h133jmdrod38pre3upmcpnfn2/pamagewetulezabetiren.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ad30a8c0cfa9fc918043723da7cfb49f/xipuwutu.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5159757e538c006ef6a5284efb3a4d52/zoxuvoputa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608975e17bc12---kudoxazuz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9571adaf---43190592228.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8f6cce6c7dd8f6adcefa61b08578b05f/bimujozelo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160730cc647c94---nidafadudusubi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qv7o9eujeht82qshrunm8bjh74/34237751587.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4369ba0d18---kadanavegivaxinibofu.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/judavol.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/29412032746.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/topakusifixij.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/fedowefurigemevuwe.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/58590510409.pdfIn PDF document text
    • http://wenxuezj.com/images/File/dofokaxogip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cornell+transfer+requirementsPDF 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_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10652 bytes
SHA-256: f2fb36ca787020bc02ca6bb588585bf064e6c777fd8737e51d8ff3881557e98c
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 17836 bytes
SHA-256: 52ab640c395ddfaef09aef1b4018410cf6aea6fbb23b96082903e4ec0d2dc98d
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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