Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f8955cee384e53…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57486a4831990b2307c307dba3df3463 SHA-1: edfab15509d67617f845d286a7d800e4fecb3159 SHA-256: a1f8955cee384e536f2bb00870a2ab4a43a811ee5287c38aaf7c9f2095cf04d6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true destination and leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608756131f1c3---81471959780.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gizizeze.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/14444763427.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/miles.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/donatodu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41c50ccd6---87747699161.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/68790307831.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192ee2fc42---jotifaginorexegufu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4141a3f59---goporomunemi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/89876113594.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/73604936618.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/kitinumerasevubazifogi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/68122691602.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608251c5491ec---10101996560.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/68699082675.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/89302930807.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/71503126488.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/ziwala.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5ea7f294345121db97e96e3ee7e44bac/81143856216.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613155575bd54---fopuburesotixekuja.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7d99be44---wunexopinowomelik.pdfIn PDF document text
    • https://wsbtitan.com/images/file/voxagizunixeg.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/51841122341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wealth+tax+act+1957+bare+act+pdf+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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 11184 bytes
SHA-256: c46d794caf3feb16291e49f59961ad26a877f8537fd043e6023a94e74c766ccc
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 17280 bytes
SHA-256: 86a245e453a27534c342c063da8e441a6cf5640e15fb613ef8de02f5999d3bc5

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