Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1b7309df213d5e…

MALICIOUS

PDF

189.1 KB Created: 2021-07-02 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81df79a89c39c7bab5efc7daaf274fa9 SHA-1: 4e5d3d0beb05b197a43e6d0e6a44bd341a69eeb8 SHA-256: 6e1b7309df213d5e07ad8f92b8986f0c5e03e3e8f4cd2d5516ee2e320df17433
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9640

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://oniceh.ru/uplcv?utm_term=what+do+you+think+it+is
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e7d3985d---juribomomawaririlemu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215330348e---pezezis.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ca15978b---biwizowume.pdf
    • http://geose.ru/userfiles/file/39995855363.pdf
    • https://pasarantogel2.com/contents//files/zumulov.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/n43qj0gf564lhadd23ufm96pv2/kogadubozamunit.pdf
    • http://plncse.hu/php_data/file/62829015003.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/57e9d0ae3f1ee5dbd454c731f4a960a4/7648302976.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6661cdac---vujiva.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/38ekjp4lfuo7k68cj8oaeqpn6h/86532576313.pdf
    • http://bundoreh.com/fckeditor/files/file/xugavir.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aface587c---41479675461.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b7099dcd3b1fbda38f33e5d72477144e/92049362519.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ae65dff9---fomewi.pdf
    • https://terminal.hr/userfiles/file/99616342383.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ea6bb13d---42207452082.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/78874779794.pdf
    • https://bandai-k.com/userfiles/file/xitesunam.pdf
    • http://duda-tech.pl/dudatech/upload/file/kivivolinebonomaxanesifix.pdf
    • http://fixafilm.se/userfiles/file/visulibewovabedamekejatew.pdf
    • http://envisystem.com/upload/userfile/files/55770638620.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888bf4ccc63---tomanezimufuzaviluke.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415abdc605---guzajuz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721985504e2---18733619198.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d3e.bin
6581ea66e5518d5c8e79e3ada2e70ffe7f0b7a83f6d5e1c64f73cee345901261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 17440 bytes
font_01_sfnt_off00014a4d.bin
a080af67b81c4e00f6d13c8223bb4fb10fa69f481cf0f54373068929ed9d48c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4D 148600 bytes
font_02_sfnt_off0002b5f7.bin
6cde8d058a497dcaf393370ab4170f03177ee3fa9867e79aeceba3fa810dcb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5F7 10368 bytes
font_03_sfnt_off0002cd60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD60 16792 bytes

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