Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc5b2ed98c3edb2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 01:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e325dd0d5df382d99042d63c3ba518ce SHA-1: 06f5d57b73972868553c38006fdcbde665b1f94f SHA-256: 5bc5b2ed98c3edb2f798fd5a184bf631946074c7193c7b22e4d95405b2ced4d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

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://chcial.ru/uplcv?utm_term=metabolism+of+fatty+acids+pdf PDF link annotation
    • http://netmutum.com/userfiles/file/bodavokatepofapazaredefi.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/sabedajovexako.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/42536043452.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/xufokeli.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/59514159859.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/39465428600.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6d631d83cfa87ad7509a09f74460ba2/97829272990.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609044acc982b---58450657618.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/zumidiregujod.pdfIn PDF document text
    • https://semut73.com/contents//files/86786776218.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e3331894---7008805649.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f34f59feeab1abdd6cac74e781e0a37a/91115943074.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/zedosepirow.pdfIn PDF document text
    • http://dominant.name/userfiles/file/nekugumijinotekupelimada.pdfIn PDF document text
    • http://quaint-house.com/bafel.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/tazofejetunek.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/65385967819.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/df60esnp0mpnuaslppcm81nfo8/sowibi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b509043579---fimesexuv.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vimaribiposowav.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/9913298525.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a706b58f---80814237330.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b641e0a662---79627146624.pdfIn PDF document text
    • https://yorapp.it/file/guner.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113aec59e87e---gezurerovazirug.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17908 bytes
SHA-256: 7851729cf1d6081bdc05cf9347b95b0168ec1940b66d96ead22bd664ff064c7e
font_01_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 10824 bytes
SHA-256: 0fa011b39e4795b8907456a39abf5fa15965bbe65ffb451b594a41a6f3657015
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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