Malicious PDF — malware analysis report

Static analysis result for SHA-256 358e3bbff134ce60…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 07:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9a2ad8cfe7516ddf277bd3631952dad SHA-1: 7c9de5a06ea91536f85023cdeef982b8da9b4b46 SHA-256: 358e3bbff134ce60eaf5903e1c3502336eb3b191f4573cfea50bba20ebfb3040
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics reinforces the conclusion that the document's primary purpose is to redirect users to malicious content.

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://wellogo.in/userfiles/file///21432268908.pdf In PDF document text
    • http://grimastone.ru/files/97026486794.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jelojolunusowufu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/diduwifusiregus.pdfIn PDF document text
    • https://davnosti.ru/upload/fosugafunabebigofiwij.pdfIn PDF document text
    • http://grafitym.kz/files/file/bitemiferibasedu.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/lifokex.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-9/20210909185935206508.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wadivevaj.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/97423940818.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/mexode.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nudibinegubelupaxagufuzim.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bcf0e3a06fa6c49649dae4e55d949b9b/tupewutevojapixalewaw.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/viwewamoxuvawe.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/vizosinakowifoza.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/19736777088.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5397a667a6a5eafdfaca45c05ad16df4/72442475594.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dulalefugaveg.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/ponoputotefokidonuve.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wivaroge.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/38805215714.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gejomedumotive.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe980a1d62---43160311144.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///92618331417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+create+icons+for+androidPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 10500 bytes
SHA-256: 4766cfefa8865b7f9ffd689cb3374a358c50c11bfabc8b56220c8a864219da77
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 18868 bytes
SHA-256: 3860f45c790d74966e2b386d35f1680f1c7c8a1a565607d8112fe9eef9ada273