Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c6003545d6024…

MALICIOUS

PDF

87.3 KB Created: 2021-07-29 17:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 911b5c6e7a9c0423aa70b780a207470e SHA-1: 9749bd2d3cf59f4a4dd2a3b08bc65238e97edf18 SHA-256: 239c6003545d60242c2bcbaf3a289fc614910ab2926f70c1ee777a579fe75fc6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of embedded URIs and the nature of the heuristics suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4047

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=fundamentals+of+differential+equations+and+boundary+value+problems+7th+edition+reddit PDF link annotation
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39f4d6cb8---fanepabosor.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/kajomevapi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/bapokex.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e0ed3a30ca287fc11a1aa2ea7df4bbf5/xirovogulusi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47f5571e40a781189730f5a2de6705f2/83925136393.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/zufewimagujozisigatu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986f3a3d7fa---42723396381.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/revemulanategorazuvuj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6241c6c4b9---lifidalatokod.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a71b1645d31e200c7d6c7e1c9ee24e8f/gavasoponu.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/baxudoginomiwabe.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/denaxugafuforiwazozilud.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/gibus.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rewifigawijum.pdfIn PDF document text
    • https://andrejc.si/files/file/sawobidek.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a698d4c39---81530823323.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/60842947373.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0b65807d4ae6b7d87605a341017d085/8911902900.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0acb55287d0dc348bb1923359a6ad516/41046141467.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/78624444303.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/98442695615.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e350956705---zarujafasifakivoku.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 18380 bytes
SHA-256: 0a011632e2f1303464fcab511310db700c9e7010b5e60236c240082e8df6eb78
font_01_sfnt_off000132ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 11356 bytes
SHA-256: 7257b7f33d12a84f1f8f640ab5be211d3c2c909f3b2dc4736b73af9dcbee24dc

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