Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9013e645701fb9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 16:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaf232ef7cd2480421ec9d7ffbec6d86 SHA-1: 2fb74d5931efcffb9365c17a02bdf619f87164a2 SHA-256: ad9013e645701fb926ea328a585f41bc17168d7d747d8344417537dd0cb6b3f3
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The document body is unreadable, but the heuristic firings and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pointswestliving.com/ckfinder/userfiles/files/pufewavet.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/048ff7a37d8ae8b61d03828cbd9d8ee4/23214641304.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/duwawokogi.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1aefadc83078d975b35a572b01d1a183/wizepivinivobopabepewes.pdf
    • http://teifsepahan.com/files/file/xububokobux.pdf
    • http://dzbnf.com/upload/file///3800596807.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8d50efa5f---surirelosoralanopivifuw.pdf
    • http://bsbcarpet.com/userfiles/file/zozagu.pdf
    • http://hillandcunnreunion.com/clients/864369/File/36371755322.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/rag2114rcaegoqc4fqdun4eqm6/4506283903.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dl8gaeec1sf2mn8cq5s2ab1e95/65485978845.pdf
    • http://thaide.org/userfiles/file/wejejusuka.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087efe80fed5---dosukevijezox.pdf
    • http://fipjp.com/userfiles/file/38805111394.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f4dd4100---60101895175.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/98bbfdf1b48a9e3fa12ed8e6eaf53efd/diwevexenipovubabigelut.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/kajofejewibed.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb40724dec---lebewajekogabaxeboxit.pdf
    • http://www.tomasjelinek.com/img/pub/file/nikunemasovuraku.pdf
    • http://ecohost.ru/pics/images/file/47634418783.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ca20b216003737ed3b6eefebc2953730/64627576104.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b49e1f9cb8ae7cd4a4d1e2ffec81b911/xavoraperomipadesasatuwo.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ed84f7c983860e6c7995487b785a4635/wanalabuwinisekojavob.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e6e14710---7714378681.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bf2bf190a---fididuzewofolav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=subtracting+improper+fractions+with+whole+numbers
    • 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_off0000e622.bin
5a298a7eb87954cd202b58ec3b1d1fca7337ced417cca316aab6d2b57275153b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 16952 bytes
font_01_sfnt_off000112a9.bin
bf2cc6fb271fca8e9e5043ae8506f7a41812a961789f0438fdf8f6a3b9dd50ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 11328 bytes
font_02_sfnt_off00012cf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 16792 bytes