Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b452ffe288de4b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 00:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 77f7154117c4f6355c9f527b00f1e6a8 SHA-1: de5ab06ff14d08dd08f4a07d44ee1443c981fa7a SHA-256: 13b452ffe288de4be58acf5bb3895455414580c8146a3e39da5f33db5e96df30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely serving as a distribution point for further malware. The presence of multiple distinct hosts and the use of 'utm_term' in one URL suggest an attempt to obscure the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4682589c618fb6544c8c73740f058e09/55762301937.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/624a69c2cdf2a306517c15fc7b39e905/kuxopeletixulujepopegim.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/988dba72b8b3d6fe8f1791de9685d21d/48919651439.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/junarowekemox.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/vuxixa.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/78e3f6558d32c086b86915f51ddf392e/19648894519.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9b164e6405bcf4aa782f578c8809e9c8/baguvosejegajijikabilata.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/230b8f386f5835aee2a61571f413acbc/guripipowudibizepubuxu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/bekaw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd13863996---35641843185.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f6cbf2abaaa174c2739a0e48b9dce175/49046239587.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160af62c434997---wovategizepemasesotinakos.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/63004095037.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3441c1f19f---12115805740.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tomoguzasepofazarefozix.pdfIn PDF document text
    • https://aedwea.com/upload/foto/wuluzudurujetas.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/12200333075.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/596blfm89453ue28epm1tjfa1d/debobozetuviduzele.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gtqvlb5pb4qdq47hdq8pr2hkn2/wurixerezavukemazipagefez.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4ca13a62bba9394a4e2f5ac9d918578b/zutujubidadedixexe.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/85e664b1858ce24b096a5472e00d972a/karawagifexotaxovekugox.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/69430385060.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/85ec984cf728a1143df9228a0dcfa94b/mugifunovotumisibezaso.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fdfe3a0aaf5b0661fd6a9a5879425923/79906119008.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/mavanululubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tailstock+m+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 17736 bytes
SHA-256: e520fc23283d6a51cf610c4c76885d3bc579fff74e5889a7293a9d049335ca4a
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 10384 bytes
SHA-256: ab28269179492494ed1ca601392b7fdc50349dbc5bf646f070757e860e82b545

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