Malicious PDF — malware analysis report

Static analysis result for SHA-256 a353f2dac08b8016…

MALICIOUS

PDF

80.1 KB Created: 2021-07-07 11:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 564756a14503cd7597e47421c163cd41 SHA-1: 4534b5ca129f25cab1ca95728f65a168c989ac4c SHA-256: a353f2dac08b801617318782b9d2346b2777a5f881fbdb969d5e000aad48c965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093366196f0c---xovijopazexadosevikagow.pdf
    • http://alacarte-design.de/userfiles/file/nugunadimedumade.pdf
    • http://calisnt.com/uploads/files/31450225651.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/38d717e5edac1e87f2f707d01081617d/gegafitumoruxevebewabufal.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3e9c73a2bff5f2b2bf4b70f3181b9e78/tubesiwozudegej.pdf
    • http://ceskylakros.cz/userfiles/file/gopajugefolemusiv.pdf
    • https://muratay.nl/userfiles/file/42377410458.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvl1jadh3hikuq1rvr0825ql32/68731036609.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/86151212201.pdf
    • https://aterhesseg.com/up_image/file/guwomeda.pdf
    • http://o2ashop.com/ckfinder/userfiles/files/8595564829.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/e3d4gn9k9sgn6o3155c3nbkqj5/49333553612.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/pirazeta.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/h0fp997v1lscna8p8cvingbs44/84275468069.pdf
    • http://billedbutikken.dk/articlefiles/file/fipanotusel.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6aea7f22---gesekasamunuwez.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37261448a3---39591303542.pdf
    • http://korealabels.com/ckfinder/userfiles/files/60479892763.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe44dbdb16---85957538145.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6129cdf4---18357303413.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bc137e373---belorilulatojurar.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b836955cdb5---suzep.pdf
    • http://www.prieteniitehnicii.ro/documente/file/9317137080.pdf
    • http://protok.pro/upload/files/12939978498.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=expanded+universal+science+class+6+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_off0000d754.bin
942bc62d1aad406205d0937544b924577b22e8563ea7b31a2d3c6337a650b9be
pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16528 bytes
font_01_sfnt_off0001021d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
font_02_sfnt_off00011a34.bin
80484fad7bda1e77cd5f347faa78afa62cf14c661552920acb9242c10d93e7ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 10816 bytes