Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a6a2db34f2021a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 17:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2c80869038e4c44bde5658b4151bdfb SHA-1: 19a09201c393d9587de472b183ceffd8fc391403 SHA-256: 94a6a2db34f2021abd6efc03c0ccfb2d4fd2f4db92caf53fa0d38cf76063a838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics points towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://posaonakosovu.com/ckfinder/userfiles/files/jusezepokinikegetetavoka.pdf In PDF document text
    • http://eortak.com/img/fck_temp/file/xivuxare.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51108ae34133dd9f3282fc1784fdff92/pukez.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8974fa6f2a---78492268241.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tjit8s4r8e7cnd509kjnqhu372/zobofonet.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a960c4fd---piguxonadasepat.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/38566646649.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/tewaxivufozibubi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/gagaxoxesiletepener.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/dutogetexatofeta.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/mawizub.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/55576453735.pdfIn PDF document text
    • http://apvn.info/userfiles/file/15460945071.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/47132828201.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0eafeab86---57092906639.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/44694825694.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee7f73740---kodaguxijupusabaji.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/73664420086.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/bubudix.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jelosepekoduno.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/41980528268.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f077fe081e4---zedataborebitoxa.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/89836223431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=icdl+module+5+windows+7+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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10744 bytes
SHA-256: c3ed8eab4431a04decc1faa44cd128ffec7f9f0076783ca2cfcf106bfd91e7cf
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17816 bytes
SHA-256: 04efea664822350f251b835c7f3dee89b865822dfcd514af5a30dd1461bb6c65

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