Malicious PDF — malware analysis report

Static analysis result for SHA-256 65903b5590af574d…

MALICIOUS

PDF

88.3 KB Created: 2021-07-05 13:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7fded711063ef90e1b0f96781c34b4a SHA-1: cb012882cbf7076d82c1ca9bbca498de8207288d SHA-256: 65903b5590af574de772eba2f47b18adff6370a1242b9f8db98b574018a91be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=mary+mcdonnell+rebel
    • https://alshamiltrading.com/alshamilfiles/file/xusezumavatopapiluli.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977c239443f---xemeledizilalugija.pdf
    • http://rhodeislandalpha.com/clients/56223/File/63210929339.pdf
    • http://dvarenda.ru/upload/file/47412720685.pdf
    • http://dzbnf.com/upload/file///totaj.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f4c95d541f126b8a30f1e3826c25d006/gigajunazowejokeworo.pdf
    • https://mps-india.com/userfiles/files/37319075761.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76a5ed193---seborefuvuxidodomafuka.pdf
    • https://topclassgreenery.nl/images/file/48775305339.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/77546583852.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ofdjc1r03a1kfdv90rrhm538eu/77322771858.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aa3c4ca4---fuxapotejajuka.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609880655a69a---lamulitase.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/803f0d536034567bb9d9eb3847211ec5/ludigukavo.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/vigajazotajokizut.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/frshkhebpd2cv6ugl6ngf6m31s/99322438584.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/64308185091.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/81568162033.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec9ecb910---5472549397.pdf
    • https://vmwarts.com/ecovic/file/90695224478.pdf
    • http://toshiba-center.ru/uploads/files/27532305686.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160727f1329f4c---bitagidomokarazulamubevu.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f060503e24---vidokis.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19c2eb72ed45bc90d23c9803dbe81f07/sozabexun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d0.bin
022e8b1e20e77b6250d4da6f195da9f3d24a1e482adc3db9270a72a4283978a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 18348 bytes
font_01_sfnt_off0001246e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 16792 bytes
font_02_sfnt_off00013c85.bin
4b6d1e04d83daadc65512810de8640d378319feeb58046dd5c865dd574522c25
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C85 10420 bytes