Malicious PDF — malware analysis report

Static analysis result for SHA-256 625d4f905b3ec9b0…

MALICIOUS

PDF

87.6 KB Created: 2021-07-25 17:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4b43ec195c356d0215a1d16b02b1a6c SHA-1: 8317038027c0d65c07cf74c4132d749b4081c436 SHA-256: 625d4f905b3ec9b07a0604f7796f9ba40732daf8b0674e46a637ba1a73d274d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fa6bc637---43969356516.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/53ggnil0cktmeu2l9q0imtvjk5/konikuroniva.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160df64bce7bc9---10250188396.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/21845450756.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/bapobos.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6fb82a147a5e43d39ada684d3f2192e5/tuxetitu.pdfIn PDF document text
    • http://vizcsap.hu/files/file/9633533223.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/nepejijajasujijifobeperir.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c22f7b040---maxifogipasuvirofo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f81e5f6136787c59eca0aca3f2d573a/67182234256.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/15109336748.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/maluton.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/warafipuj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/luliva.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/mifetozukopifot.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98802253565.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9tdbmfdpif0onolkkq55lra0c0/36988723642.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0344885001624958894.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/30/file/vozig.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088184cbdeae.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/dirinemim.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/120040387.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/40067239955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=que+yogurt+se+puede+comer+en+la+dieta+cetogenicaPDF 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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 18248 bytes
SHA-256: 6e7f48bd2266d7f72d58b76987294861cc1124fea4491f1146a411f35858e6fb
font_01_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 11128 bytes
SHA-256: 23566bb57044beb48eff60a6093290673a5a4cfd9f0bf47f517870e97d0b86ad

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