Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b41a435b36c728a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 09:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d79637da9de3f8729b868e1092da546 SHA-1: 811d8b02dd3b3cb735821438fd926a23d74b92b4 SHA-256: 1b41a435b36c728ab5cf5184088dc4668c4b7d9d168ddeda209c79b10c6f02ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/57a0e11213bf508b32f8ebf948b21d05/wosozapuzonejanuwaremix.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f2369c7---78218837942.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a02b4249b---zapokepimevuwawerinozadop.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccb5c0575---gotabosas.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c74e01aa---2850837683.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3bc0ac225e64a04aa0538a99d0baa925/nimugonemegalarepikep.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/jeveme.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/puviserituxexubojamapuja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d5f56b07---namodonedujov.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/1066936686.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gtud2e3rbao8dg67o6c75o69nr/sanaxujaxufipa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/65877863188.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25e0d5071---jerazuzusaruvanuli.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440a5383df---telitawejezazenibafogobof.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/82353113414.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/10866275776.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/53715525680.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b1a647fc1681fe843c3f03ffcc202137/3302248645.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/tikok.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35538b527e---jekuw.pdfIn PDF document text
    • https://cape-electronics.com/media/file/vizosizobagoro.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zoredozodu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kamene.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/4815009207.pdfIn PDF document text
    • http://ipllaser.in/uploads/70198615001.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vuvutuveladule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bragg+organic+apple+cider+vinegar+miracle+cleanse+concentrate+walmartPDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 11060 bytes
SHA-256: c17152a65ba257a644242e2e649490c5cc030a2a29a2e8c2ebe2cd65f9e8b83e
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 16628 bytes
SHA-256: b26c8c0e3c63658a10b6b8e7b2fbe4364f29dfb9e44be8dd5d47271f4062dfab