Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3cd81dd552866b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 12:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b5d2d20c20e434d26bf5225c99b13dc SHA-1: cf1207c4318e6174e7218a763faa11c2612e2e20 SHA-256: 3e3cd81dd552866bb5917ad479fac89f4750ee338bb04cb21c856aea6ca481c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5173

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://pixomot.ru/uplcv?utm_term=poulan+pro+blower+owners+manual PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf7e3cbab---kepimi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043f07012e1---volosirinonenutawafu.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/dotasodevabibirozexax.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e96ca84596eb8829348103faeb6a1ba2/pedibuvogawupewodoketudi.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/62187618341.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/lapegopejijefes.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d127d7d1---25437518104.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fded55acbd9---reragiw.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///23416015931.pdfIn PDF document text
    • https://educhina.mn/editor/files/95361014448.pdfIn PDF document text
    • http://muszempilla.com/files/file/66366496423.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/69345041786.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f58e3a37005---80392023923.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/nt0vi6arsljdikacuvmssmudc1/96568474142.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/sijonifugoserulolesubo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cc3faaecf3b0cd41706f56e313e42a7e/kalovunafoxarolelonix.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/walopotizilemominiwuwogaf.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/fesutoboso.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/72292940064.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3af8032d126a4a00ed18d2c78c04b3e4/11930858662.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/fediditujiwese.pdfIn PDF document text
    • https://windsbs.biz/files/file/40879297739.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/miwufaze.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 10548 bytes
SHA-256: 717bddd9d5bfc42691feb82f5c249aeea2a2f6f5f65e1415b0ea673a6878ffd8
font_01_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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