Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8af4a1b5a550f8c…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 23:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d86196b09cc501a260385fe033b5d1d SHA-1: 2960ec2165fdb8302bcf7f7457ff12a5333813e8 SHA-256: f8af4a1b5a550f8c9c202fb820e4cd663b0a3d83fff24a6c9f2e881986afb057
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 critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=how+to+find+the+period+in+a+sine+function
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kelhvl11thqltor7ebb1r9j9j3/27069093473.pdf
    • http://escqatar.com/uploads/userfiles/file/file/25905725711.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d55bd8cf8ff1b4c2882dd264c303e4b4/gilunupoxutipe.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/resubonumav.pdf
    • http://anthonyvienna.com/sites/default/files/file/2470060128.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef656ed3c---77770057708.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6938d66891c197a11536c09cdfb4be76/23998243590.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e8c253aa39ea2cab842b3a00f54b24d7/351233739.pdf
    • http://shinies.ru/img/lib/file/kapoliderumibaga.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717e47f3307---64126376139.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0e787d596dd28523b3f8be7afc23c3f5/vukujo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783ce483d9f---30992951830.pdf
    • http://khautrangkhangviet.com/upload/img/files/borupimav.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9p3ipgmir039b75v3fqcvo48pb/27280692419.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/d6ca7cc9562fc17259fc0a49e6d2a51d/83595964663.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/96p4uslhves97552vbogm540ks/bafegi.pdf
    • http://eperon-kochersberg.com/img_db/xelemesu.pdf
    • http://ugyvednok.hu/userfiles/file/mebusuza.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/04862cf57fdf73a391d3984345d83e20/35670039271.pdf
    • http://heyumpnd.com/userfiles/file///jupezuni.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49774de2d---jatinorexezuveb.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3be83594---38237572022.pdf
    • https://ph2020.org/FCKeditor/file/dosafabom.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/csd5hb6qncc2n49d4iuik9f3ne/13927450413.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101df.bin
d9674f078da4e49b5d381f7a8b788a624e86036c22ca5e1d246e97db12a81c8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10848 bytes
font_01_sfnt_off00011ae0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
font_02_sfnt_off000132f2.bin
64d6969a956b7e99ca1b59c30f682c74ddbc606d1a8e6cfb3fa940d3a5a9dc25
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16492 bytes