Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09f51e6fb6c4909…

MALICIOUS

PDF

79.7 KB Created: 2021-08-07 09:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20599d4b3eccc76c503727ba1cf241c0 SHA-1: 3cb9db998168adbe67cbcfd576fa18756960a5b1 SHA-256: c09f51e6fb6c4909f3e30b7d154b0b7d16e669a1c75797897a6320d79e659a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2d9d883f---2529718054.pdf
    • http://thietbianninh188.com/uploads/files/tupebotovadosubakozidexas.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d4e5146623fb1386150375b78c7c2b33/36994111266.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/digividonaninogatipoxorer.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/h490jh2791ter2unap77lgb6ee/maxizujuzosizefifimip.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c02937dc8---xefafudulekemuxix.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c7efbdcd6e16d8b079dacede8720e345/zabubapulewewudabonidi.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525e8bfa96---pepiwavumizu.pdf
    • http://humanlitech.com/files/files/42131988565.pdf
    • http://studioego.cz/userfiles/file/61212447808.pdf
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sukuwudiruf.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/zuwalezifabogu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed080608f---venonisako.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/28280874129.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f178d3e4da---lutuwitevutoganawakez.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/82327e9e35e826b57c349a0c4cdbddbb/xuvafutopewaji.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ac961128dd56f9824b2eb5e1a6ef42a5/14568423404.pdf
    • http://fw-simple.com/uploads/files/49883149434.pdf
    • http://studiovalentini.eu/userfiles/files/gewiwi.pdf
    • http://adveotec.com/img/file/59229049765.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717caf1ff6a---daxokinugix.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/tosonujikofupogegugilinux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=anatomy+and+physiology+coloring+workbook+answers+chapter+3+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980e7a9adf---begoxusukuximoburefukajov.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_off0000d2d2.bin
7d030ddd08f4d98a2fe92daf642a6860b8435810dcbcc9ab4b444ffa02121717
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16092 bytes
font_01_sfnt_off0000fc2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16792 bytes
font_02_sfnt_off00011443.bin
fdb5b1296ba5cb6faec41509bc808d71aa22ca97facb2d173631186be3134fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 11652 bytes