Malicious PDF — malware analysis report

Static analysis result for SHA-256 435de6adf3052f6a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 12:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17eee0cb0f7ec6e93cb84a4872b0a450 SHA-1: 7cbc867c2324ea49bca50ab172b54c78398887ea SHA-256: 435de6adf3052f6acb156a52e58f699eb949f0660a5ba2b0bf48e41e198b85df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc236bfd8---12687409933.pdf In PDF document text
    • http://rnralpha.cz/res/file/ferajidemimetol.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/kugik.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e2a701417---2337430301.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/sekenetisitaj.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8119978a1---xapadupegaxofog.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/67109020288.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sujoxarudexupusal.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/28314311117.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/pufujexategujelulopud.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/bemotaxuvujenagug.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc57154ff---31995604276.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730caa6d99---2693735965.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/34748309427.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/75861aaf714da55a345e8058d1dae443/9166303753.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4910631079fa52da965e2dc2b4627012/14616287147.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/60773586010.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/18284926592.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/46074795501.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63730429925.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/38850920168bebfe44679bb37b213783/35681647571.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/50569523914.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/13234871052.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/51531801120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=boot+camp+training+program+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_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 10668 bytes
SHA-256: 513dad61e691992e5cb3277321ec5176009cffac43c6bf8690bc9edae155ebac
font_02_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 16188 bytes
SHA-256: 03a5bd2a03d6c5b514208c512d7630893027771887237d01dddd0fbabd4a9793

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