Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d942b33a792eb01…

MALICIOUS

PDF

90.0 KB Created: 2021-09-01 20:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42261e7adc454f1c84ac70b82393fea7 SHA-1: 4a510f56ba1b8fc82357f42d2597f81a6733dfc3 SHA-256: 7d942b33a792eb018d14ef069fbcaab6a2d986f29268ea03b63cf67b3b5fb8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ksuskalology.com/images/file/98897490705.pdf In PDF document text
    • http://alemotta.com/resources/original/file/18862477898.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d618a872a5---22583376100.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/75458645059.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a5752c68---3915102707.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d400c6ef4d3---majavitepezavok.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/51366323161.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b400e358---sobaxojatizawavetuzet.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/rvmm5g5cuviobv3put3o7849sc/dutowakavemuxiz.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/16733779302.pdfIn PDF document text
    • https://seikico.net/img-tym/files/65458975774.pdfIn PDF document text
    • https://esz.jp/img/editor/files/415001033.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/54df05ea2db66e1e4504de47bef53184/ribadarirajute.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7a4570b---nebuluwirudopofijebezew.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/koguxum.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1665b379b---lagapedub.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/14636839375.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa5431366---denumu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/wixabi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/22137495543.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tuwidu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/rijetabonimeruriveji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cultural+theory+an+introduction+philip+smith+pdfPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 17772 bytes
SHA-256: 52010c5985487d5affcfa4886224bf00ddfba7f04f6e5fc887811d8ebfb3258a
font_01_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 11132 bytes
SHA-256: a00bae9240f6a2f7c75a075a3fcc44d880b35faf2ff6131de3b3aeec5a903464

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