Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff16728446285da…

MALICIOUS

PDF

79.0 KB Created: 2021-06-26 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8b9f05d07c11a5073869f9a20489e7d SHA-1: 3d7a095f680bf574eb0f386c9f3bcda8b984b2e5 SHA-256: 7ff16728446285da248c1fdebbcb491a013fa007bdf50e19df48d744b2424734
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://egyptsuntours.com/userfiles/files/musuxarumexewevate.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/daa2d79d7c12d90e8eaf1d91e9f6e833/3545115487.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be396603ff1---60749959195.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/148a1e4e3f90aa0ff63633948149dbff/gitilubufojijivafetiv.pdf
    • http://tks-forever.com/upload/2021/06/24/file/33915767144.pdf
    • http://allaboutdowney.com/userimages/20792550284.pdf
    • http://dblbtech.com/userfiles/file/38720792222.pdf
    • http://sarlampa.ru/upload_picture/varuredujexu.pdf
    • http://omg.su/upload/File/nupupaxo.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/874cd2068ec5374d485254876393c118/jojisufixomozapomaguz.pdf
    • http://vstarmp.cn/upload/files/20210611_145054.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39896c06d---wexujujegi.pdf
    • http://kochamsushi.pl/UserFiles/file/ramemenevarugazexakem.pdf
    • https://audreyheselmans.com/_files/file/vemopeginobajex.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02d1f965c958007ec541889366dc3b04/64549659386.pdf
    • http://terezmisszio.eu/files/file/43892463151.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790253426---xedowikobadapuse.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f721f9e4f3---50394591403.pdf
    • http://guojingmall.com/userfiles/file///9571676200.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/660211dcfbd4ba18b870a9c47e324d3c/tugamikilusurafav.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071f60f589aa---32134882929.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936bb50916e---60453594311.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9df6c5136---67537405880.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=riddles+and+finns
    • 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_off0000d378.bin
8abcd209a42ba46cd2b588ab108db6c76e144098f5e3ed75e12269ab2383877c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 17340 bytes
font_01_sfnt_off000100ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes
font_02_sfnt_off000118e5.bin
0bce8d84ec5593d8ada5e910d08582ac78b71d9368a047764a66bb83fc16deab
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 10072 bytes