Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed93064adeb09af…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 17:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cba032e4c9657f75bae5dc107f1789a SHA-1: 00a9829ef38bfdfd71abe107f0383e591e42d504 SHA-256: bed93064adeb09afbaf7a7698a4dfb33a829188a39a2bc9caa73301b6aeb6959
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stonebuild.bg/f/uploads/files/43077113128.pdf In PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/77238335964.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/bimuxokivomokivoxujigoso.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc22ba3155---85979938130.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/koxedabosafusaf.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd43f22fa---latewokaxaretuxurefuzawob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e72810a---vosijirovivizosepiti.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/93256937792.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/39834337749.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tusutesu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bca058aa641---fafovuwejifizozufenurave.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608986f94a57f---talozorupaletomomur.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cbdbda5bd---zugubadakivur.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/89277777212.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210628_80ACB28E9E586D8B.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611640d1d8dbd---14662658049.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/929d02f6eacc56fb8215aae635aaa27d/konefixujegojiliwepape.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/753aa91200fd015fc80bfb52750925ff/jawufojipuzoru.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c241a13ce7f417823ccd39c34180e075/98231566252.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5gre4je45rurt6ufi4fo0nvi4m/89190987771.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062716003892.pdfIn PDF document text
    • http://stonebreaker.at/17166524654.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/tolevomiminepomasamoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ibanez+sr300eb+manualPDF 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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 20040 bytes
SHA-256: 74421cc6895c685938ba7313096e63c9e35cda7f1b0c249ea628ad75449cc310
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 10504 bytes
SHA-256: b61c6afc447e08059b2e5d1ac230821ed6673203e644e648c91521b802b1feee

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