Malicious PDF — malware analysis report

Static analysis result for SHA-256 e616de165c0e4751…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c7ea7c2617f2906faa9522dc7f0721c SHA-1: 06649078e1b8b8a5dd20ad83468980cf157ee34e SHA-256: e616de165c0e4751bdb4f0f21a990c6cf6e76f604c317deae327551e0a8cd36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malware distribution scheme.

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://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/7efdbe081bd5aa1f3c62c298084f65d4/40853704382.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/3805100712.pdf
    • http://dichvugiayphep.biz/upload/ck/files/jasifat.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607541ae0db0b---61631461761.pdf
    • https://thefencedocumentary.com/adminfiles/file/zumazijebitajibuji.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b1c821074c1f90f6d0f337afe746c0cd/nodasimawajefo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08c9c8199f---rukizakevox.pdf
    • https://ntiverification.com/userfiles/file/56957499630.pdf
    • http://ingatlantv.tv/userfiles/files/87318852373.pdf
    • https://producedepot.us/userfiles/files/domupiladogubinofipogut.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad8f09419---68546542122.pdf
    • http://tate79.com/clients/868750/File/62404521093.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd24cca82e---kifovegudebozumezelizobog.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jilu277l45njtvhd8os83ffvbf/xotuxizewabofisisedab.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a051f7825c7---8452479897.pdf
    • https://actorconseil.com/files/file/79106792954.pdf
    • https://unosms.us/userfiles/file/zojuwemogalasimuzuzo.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/romolejaxi.pdf
    • http://teplospectr.ru/images/files/xugajetu.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbc4ec851---dotinoxajitalupomasekoram.pdf
    • http://ezibra.pl/upload//file/10753835240.pdf
    • http://aaaexpressheating.com/userfiles/file/xibidivogerafilileruj.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad68d6f7e---66440990777.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=good+morning+text+for+him
    • 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_off0000f82f.bin
0fa47d072c1218de33b3f99c1288ae9b357bdd5c45daa44cd6a6ec17f112e13a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 17096 bytes
font_01_sfnt_off000123fc.bin
8fccc19532442280e5a6ac7aafe0e77433335decb1fbd0cb4ff706b8ba8ab6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 10564 bytes
font_02_sfnt_off00013bac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes