Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f761c4645089f36…

MALICIOUS

PDF

81.6 KB Created: 2021-07-17 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f724a1e119fc6cc6bcbc82ae6cc9bd4 SHA-1: 5bf06498d3552ffbf5ad85908f3f0dcd35f1c978 SHA-256: 1f761c4645089f369e0f9a53921f8452b8c28e2ea62317a58102c1ad203e198f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fqcycpa.com/jingkelun/userfiles/files/20210612030809.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090f458549a5---19401956354.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/68091545cbb30a614bbf34f12b4df8c6/63074681813.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zajoxajuwemo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/15248111628.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rnh21r0s6ttmr0ja0plhuaa9e7/32884479064.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c166991fe2---vopamunibu.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/42892991689.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/dapuwoxosaxokunile.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9c1c706a9966fd6fa7a65e8885b51d4a/bovusosusigunemubowewo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/28864ddd991559d1c032c55cbcb51f08/vuvemazoredibudumowu.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/73379688325.pdfIn PDF document text
    • http://jp-cable.com/d/files/fadukovebisosu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160814caed2942---domizewu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5aehfj0r4h9fg69ed42fas207k/naronaxemidetepisiwuv.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/jasegapojilulokukutonerip.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gid6g0kqruddetck9cg9dk9kl1/wumewekolimedag.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/5b94779f357d3c1629695243fd1de653/rozedi.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/balanagejovijosawejafedeb.pdfIn PDF document text
    • http://hkalc.com/userfiles/zezuvibarofozub.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/afc4c5475d37a1e26c74514662cb747d/73768163271.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1496d9ff---53239684460.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae239d1db---64556886769.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d79d870ac---vixegurudetewaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=music+for+sight+singing+6th+edition+pdf+freePDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10952 bytes
SHA-256: 50c259f820906d5770575a525fe8d06314e21030aa244add1388dc94ab25c5bc
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 17588 bytes
SHA-256: 2a351c74e8bfc71169f52454763c4275ae6c73e681fd8572cba38d4958513e6c