Malicious PDF — malware analysis report

Static analysis result for SHA-256 20236d8df83ed9aa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67abc723f5bfd3f0ce96784f9687c343 SHA-1: 4f203094b6726e1bcd53839bfda88c942a3a0526 SHA-256: 20236d8df83ed9aa16486f0f940044315314bbb1456ba28371a99abd01e8b568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=compress+pdf+files+to+very+small+size PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c00070a7cd---banofupakalidupafak.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gugomokemigesasese.pdfIn PDF document text
    • http://quinta.cl/upload/files/22957892697.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/58782659964.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/38099171882.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/lekujanorutolulem.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/13154021472.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e017262e3d8---46031112714.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/87045781656.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4a3b1c7495aef2564bbc492b88d31b86/90705715470.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210713_B92EC9A8E7232065.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/rakujadifedefami.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/v2355nji3t5gq638ulcgalkk7h5ps475/67320389226.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db66bb3544b---zatesiz.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/26299440418.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/98675071574.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/pamobep.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/6b06b4e246e385e1363fd19331a606ce/18441379493.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3d12a1fb---noxuz.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/lenopuxojesa.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/febumexiselavoxesipomupej.pdfIn PDF document text
    • http://htwy.com/upload/file/fawul.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/940dc500e2ac630f8e9b867a11bb3253/guvawelorem.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/9998011256.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3i0v7li40cbnorudde153brj14/97886677896.pdfIn PDF document text
    • 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 17080 bytes
SHA-256: dae648b3353b2b822a04796e56a907a2304c693f3cc7d6e62219738dcea75b8b
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 10828 bytes
SHA-256: dfe8afe7a31801186360d469c3436824bb6ab17064b3949ca128ee99c12e6430

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