Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb9d36710c9c4b4…

MALICIOUS

PDF

81.1 KB Created: 2021-08-25 05:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a1f1c451bcd9a581667394da6fd89a7 SHA-1: 8ec8c919493ce4aeedcc63ad9a73168d5d2e2812 SHA-256: 7cb9d36710c9c4b4d89a6c81add56fa595086aa71e1de659c032f2ea749cbe91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=coldest+winter+ever+pdf+free PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/39991097288.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/80844923158.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0f85ab99ad7bbb453bd523932db79956/robeloxosilover.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pipagatiwusamud.pdfIn PDF document text
    • https://luminex.pl/upload/file/wudaxelaponupipafulopoven.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/thifpm5ps7cfn9vvtoeeo9rus7/57439079397.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/gujojodovipasifetugud.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ov92ofj3udr1k4clujho20qls/36106968828.pdfIn PDF document text
    • https://soechi.net/userfiles/file/8753233384.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235fa800a4---12418168765.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da1883caa66---40042689037.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48530533377.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/jetofa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9521f9c5---36161279354.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/8758559487.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/refizixoxotojapevotumuz.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nokadirovazuwizagezum.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tufaxigo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/muvokepanarodovamavisew.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xulogutivo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610701a1e6efa---luzor.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070407384673499.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/71dc4fd40f1edb6c44c1ce98e187ff3c/36854355729.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10512 bytes
SHA-256: e634ae334b31d4b99cabf1a1a31be1b40dee295267fa4cbd7b8ed092c40b4a51
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16996 bytes
SHA-256: aa79b1df043e1407fe2189be44edc0fe7a7a5630fafa5704c510fe46b8256c4f
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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