Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae37aa27031e47c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34b2a48cc81fd20d24a8b1eb3c1cc455 SHA-1: ac95939ef01d4639eba4dd2687f7abfe16fb055c SHA-256: 4ae37aa27031e47cb3f8ef1eb8b6e0936222da90d2bf337c7f556c566fbb68ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iltorg.ru/upload/file/2073824925.pdf In PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/maboravija.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/22ff143d4bddf7e6dda91dbb8cfb626a/bimolujaravoka.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/981467351.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee40bf138---17054194568.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210907155719.pdfIn PDF document text
    • http://pk.mo/userfiles/file/dubebanoluvefaxe.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/xumimopemenuluxiduwifapan.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/8376548593.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/56219517988.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/gikuvefudorijofafovi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/36540908299.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/7044513331.pdfIn PDF document text
    • https://alkoplast.rs/files/puxoritox.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219388138783.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b8e960bb4e3d056843af8e193e9b2f6d/71271566196.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/73770283146.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/tilajodolew.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcef6066c---kulojorazujene.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914050236.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wosotefisatudisofu.pdfIn PDF document text
    • http://levotst.com/uploads/files/suzopidiwetodudego.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71346372756.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/116383105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=main+prem+ki+diwani+hoon+full+movie+watch+online+123moviesPDF 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_off0000bd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 17084 bytes
SHA-256: 2807c8067b86513a18e6d29586f14e67e20a3710d6913d8373e07afee86af458
font_02_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 11564 bytes
SHA-256: 0e176edc3b19697eee51e1975c373ee8bdef65fdefb3c0215a16bf915460d224