Malicious PDF — malware analysis report

Static analysis result for SHA-256 385040985dd11577…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 21:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99b03173a1558271442c374c9a0f0043 SHA-1: 846c364733662ab38a9f2e11843958c4b62fbde0 SHA-256: 385040985dd1157770cfa7d3fedd81f0b1fb61c4197c490eecb2bd26b17d24f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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://audiohrestomatiya.ru/content/file/wurinoxibalasazebit.pdf
    • http://letresorellebio.it/userfiles/files/digasaxarorigogar.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6175b7a---79411351650.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/povonibivo.pdf
    • http://maintogelonline2.bet/contents/files/38331250839.pdf
    • http://cheumst.com/upload/fckeditor/file/90162244931.pdf
    • http://kht.civilkozpont.hu/uploads/file/1097905337.pdf
    • http://rld-carbon.com/file/49432803289.pdf
    • https://webornate.com/viking1/uploads/files/lovob.pdf
    • http://dolekkoyum.com/admin/UserFiles/file/12885359781.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/78515363362.pdf
    • https://rowadalbyt.com/userfiles/files/66802428501.pdf
    • http://demirlermetal.com/resimler/files/mafawobuzujadapid.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/bubos.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijumirujivod.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d36f8d899eb1d3cf57453365454621bb/tekotofexugakagituzil.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b209ace5---xijugagosem.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/puxovawuzurobadewibo.pdf
    • http://soluzionebenessere.eu/userfiles/files/19431130055.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7bf8e7256---1983464602.pdf
    • http://www.aragonemprendedor.com/userfiles/files/lazawefuxikuwome.pdf
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdf
    • http://digitalpolicycouncil.org/imagenes/file/porutebuvafiwutunijunaja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+can+do+it+again+kathryn+kuhlman+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_off0000cc7f.bin
f3e96a8a0b2063257e4c2ee09fa09adc94351e2f511c0a831348061642e5404b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 11112 bytes
font_01_sfnt_off0000e609.bin
a7af3cb2bc12ab3e80d81bf323d209625c90e69059554afdfde4484b3505a01a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17536 bytes
font_02_sfnt_off000113ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 16792 bytes