Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ff44127a5e1b5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 10:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27ae75e3f0795d9420133ef4f2b36d2f SHA-1: 89e5dd1114ab870cf32e02e385857575e25499c4 SHA-256: 931ff44127a5e1b5b19ec108372e6b89a2c4327c5d7ac774d38791f3ec49ee92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autopsrus.com/ckfinder/userfiles/files/pabati.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/og2vs9t6cncgmnmvq22tv9gg4a/5079968607.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b1a6a4216a5b25e907b7d5d6ffc3cb05/78355963006.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/pubadupexatibitopav.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/27673953686.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161267369019bd---41565876046.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/geluk.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098477a4ff8b---miwudemevazozikonekurobi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/jelavemezoko.pdfIn PDF document text
    • https://penzion-palice.cz/content/66983634821.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/reluvekavipuzusenakala.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xugoxasowovari.pdfIn PDF document text
    • http://goref.ru/files/file/65378209706.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/79348470509.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be47dbc2992---78181065195.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5b475fa5---44049388480.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/jesekikademanito.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210817034438.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6a5c601ba709272f082aff210001589/gunazubixomobaxoku.pdfIn PDF document text
    • http://dusunceokulu.net/resimler/files/sesugamagetitupexelox.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ea3078371b84757e7367a3b054f6787a/newapolulosivagetogo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e409622fb4.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/59332811502.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e58a6e32---xukufivosemuponokaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=food+pyramid+of+balanced+dietPDF 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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 10844 bytes
SHA-256: a7f1c0388d7e4967c5b2e632c20cbaf3d89868f0af54edbb7fd7b82d8c78f079
font_01_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16436 bytes
SHA-256: e7ce6e3ab275097d9306beb00aeeb6effdc029f759100ece05b06de48838024f
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1