Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf6d0d247e43ca0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 18:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38246c34fcac802118974cc836127c41 SHA-1: 1959caee341f8f3cf904fc632b572e0db91f53fc SHA-256: 1cf6d0d247e43ca066b3ef7adeb67589e426b9661681003757ee0c01c303d18c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=gmat+official+guide+quantitative+review+2016+pdf PDF link annotation
    • https://marblobath.com/app/webroot/img/files/zipeto.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/tapigikezefaf.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/9995389300.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/ruzefujaxevow.pdfIn PDF document text
    • https://x-software.cz/data/file/10027055272.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/84643607694.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/leruzulibarutorozuz.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/3212368956.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3515067c71---39714975495.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/66948475230.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h3qqrg53g6vbm5f5ujrg7mu9t6/jidukiz.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b290ed24d9---duvubirapogizipuk.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/xapubazajunawagasazipu.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/wijujeser.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/368a18d3fa566a046228e24a8d180c9b/puwuwapukuwo.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/11844378808.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/topun.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095b309347fe---wutakemelaliz.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/nipedo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xomel.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/didesobejabun.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108040314562801.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad453e029c9---79419837570.pdfIn PDF document text
    • 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 11692 bytes
SHA-256: 39b4f3276081684fea45e320c893b63faa9479a1a238b9a7cd6c54bc531d8293
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 17948 bytes
SHA-256: 313edfb545edee9d20f14fba2cedd77d78055b6cf22a93899f87a54cc2cfb9b5