Malicious PDF — malware analysis report

Static analysis result for SHA-256 2644f7e1f13b2b98…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 05:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ae6e0c2061685c8b2bbb069dd077c18 SHA-1: db8c9ab36ce9c6acd08bcf54b3120cd7148308bf SHA-256: 2644f7e1f13b2b98a62184f577a2d171e710405820418af26bce61dd7697b2a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=como+unir+pdf+en+uno+solo+online PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kffhd7b6mifb97da2vsuerl00r/64296415616.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/depiw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05690a93de---35620124135.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fb9da4e8---47337242905.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607575f10b345---40510522218.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb769b4cc2---58448199557.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/soluxinufikasaxezusi.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/lijutaruv.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bfdb882fc---zoxomizib.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/2552602019.pdfIn PDF document text
    • http://kaies.net/upfiles/file/37923666370.pdfIn PDF document text
    • http://m2m2design.com/userfiles/7236857620.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94cd7f8ec---seloxekiwuve.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfe8dfe7c18f2e726f76c72ed6027a46/28146399432.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/36659526287.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tinetatekazasa.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/98166794171.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/pazubuzelezab.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae452eeeb0---pulito.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vuganeturijirur.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/989e9orgs6n6b78fi2477rpbcl/pefeme.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c11c1203---71247937046.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/wasapexudun.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wanoponovode.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10528 bytes
SHA-256: 402c769aa9d08a22efcf2e9b5c5547ab5c0ece7e1b112df36e8e850b988e1e4d
font_02_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 18636 bytes
SHA-256: 8341aed857df1917f1ef83efd126a5b6390565e45349dc001510d74fdb72cfee

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