Malicious PDF — malware analysis report

Static analysis result for SHA-256 7292a3dbe24fbcda…

MALICIOUS

PDF

76.2 KB Created: 2021-07-07 08:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1dfc80ad7cb0aed49ade8450baebd42 SHA-1: 9455f9933964972ec1e8c547b36481f16bfe0094 SHA-256: 7292a3dbe24fbcda8af6e50836d7944413614ebbbba61cf05cc6a22fe66effbb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://technoauto.jp/js/upload/files/44328623810.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/458dfc5cdf15efeafa62d1977ce9b18c/3330452561.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7e4f6808a74d4e37fb15832325d2a26/bekemomaza.pdf
    • https://sayurmateng.com/contents//files/jufexumam.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/35375583768.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/p4vfnfjpvkcmd1c17kfdpa6b8f/vekulatosemumiduf.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6d6a0cc0---dikekogov.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b49b3855f9820d4231e990f26f2cace0/28034152351.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lvvpmg1ktf382m58fum05ai47/mefigepixopivoziv.pdf
    • https://rivaflo-south.in/userfiles/files/tusadubibemewunerobedek.pdf
    • http://moto-bike.pl/userfiles/file/fosaguka.pdf
    • http://leaguengn.com/userfiles/file///mawatamawavasiwirew.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980417415a6---tafezujabozupunen.pdf
    • http://modern-pro.ru/files/file/79403722634.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8944292da30d0eee1725176bbfd78c7a/ridapebipebozodivedimimej.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3815f1b19---47020089642.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d15e45e6f---mowogenam.pdf
    • http://bright-mineral.com/uploadfile/file/2021051610351939.pdf
    • http://jcon-aps.dk/userfiles/file/74558712673.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/dexoruj.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597ac4efad---nedoxenulasij.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0928acb25d663edd468e4502b6c45a75/kajixadotexe.pdf
    • http://plusbateria.co
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=physical+and+chemical+changes+and+properties+of+matter+worksheet+answers
    • 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_off0000c6c6.bin
3e15cb96fe3f2731326ad7db65f8439fdd9134e278429575b5d871113c8786b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 16240 bytes
font_01_sfnt_off0000f07c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
font_02_sfnt_off00010893.bin
dcfdfcf0fed35f63201649b65746525d7b47ebb3e8a22ab31ab29cdb81e4ddd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11360 bytes