Malicious PDF — malware analysis report

Static analysis result for SHA-256 762db07753321879…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 11:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d9c2563376fbad3ea38d984517de194 SHA-1: 3f306773487451d75d12d2a02edac83a59dd4dd9 SHA-256: 762db07753321879c57a6b97e8fba3f61a39215245ce36a53c04515f138e444b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection, strongly suggests a malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://taiwan-tsai.com/upload/files/sukegixufanab.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/fikebomom.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/60154357393.pdfIn PDF document text
    • http://wjcopy.com/upload/files/suzufelelafojonedivafaj.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/11523636747.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/rezirukojenodotarupurake.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/ganameleteluwupimewibe.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/5950367343.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/leniru.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/94415898529.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/jigaxudopisakudobi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/95207696709.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/demamakefabubajubazil.pdfIn PDF document text
    • http://24cvety.ru/upload/files/2704587787.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9a6cbcf9---68437707248.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/91000052521.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/109e15f9d88cd909e45727ec013d21e2/zebaserujajusakinibegagil.pdfIn PDF document text
    • http://theponghop.com/upload/files/54814471081.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/21495410378.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16142468039ccc---22750296473.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/84315370286.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3b6170204---80820986789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+on+apkPDF 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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 10344 bytes
SHA-256: 00d0e09c7091e9274bfa85c72d65e2e803ab6b9069d482ceaf9b152d48e4176a
font_01_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 15848 bytes
SHA-256: 3208431e17d6f52f43e38cea88b3bc46ebe548311f44999dd0356e061e2c0814
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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