Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9133f5a411b78a…

MALICIOUS

PDF

100.2 KB Created: 2021-09-05 08:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c60cf03d23d63a909eab25c1df73d75 SHA-1: b604e516bd182c3627fb16f042b8d377edca2f1c SHA-256: 5c9133f5a411b78a7d425011e5adf4ea2c15da490149ce4854fb6f0c32ea7fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=genero+definicion+pdf PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/46ae46c35a33670062a81759fa6cd277/62163001315.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pojizuvelabozejopuvaf.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/remamafuvibuxubedared.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760e23a0788---puzeb.pdfIn PDF document text
    • http://ccshecea.org/upload/files/65976507015.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/98698698187.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/88839596266.pdfIn PDF document text
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/c319oa23vq54olj98l8fv4lqq7/69467279089.pdfIn PDF document text
    • http://industra.sk/userfiles/file/94751574387.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd068bbb76---lelinakagewobuxowupa.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/db17fa10ae2920e91e8d916756074d61/mesirivuselale.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/9784338019.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2e9348ff---gumibixosi.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/65668109181.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921abd4e36d---59792685110.pdfIn PDF document text
    • http://schubert-hh.de/image/file/82643943847.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f7876f7af5f---gojerikademowomenikijilax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dda5610ec---bunigurikibabol.pdfIn PDF document text
    • http://sbkf.org/files/files/56455698436.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/frva8aa5tr97gujgttqgesdov5/58542529521.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1287899e71---19946393768.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/tamobojoriwokema.pdfIn PDF document text
    • http://promador.pl/userfiles/file/64262036135.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/wulevofamovum.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_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10180 bytes
SHA-256: 6ce6e6f3972a265e4a17c188a8ce56ebf66e45a446a135a174bb247af19d3733
font_01_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 19580 bytes
SHA-256: fbcda0156019060e3ccbe9fc9e1cd08a343ec7ed2ba5b7d44fee3f3aa9928704

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