Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1c46e5c194f2b3…

MALICIOUS

PDF

67.8 KB Created: 2021-09-04 16:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 833b375a57ebe9ed4e0c7b8992527bf9 SHA-1: 4fa46ab27373e70c3ae9cc9b20f9123b44d6e5c4 SHA-256: eb1c46e5c194f2b3d4834a9d045c4053b064428c1288cb34d17151dc229bc1b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier further indicate malicious intent. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the idea that the primary function is to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5546

Heuristics 5

  • 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
  • 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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db462a300b---kunagevotukip.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6397f80a---83389693683.pdfIn PDF document text
    • http://anpo.vn/upload/files/60296708450.pdfIn PDF document text
    • https://t2sc.me/userfiles/vadiwemorasowegad.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/56786961357.pdfIn PDF document text
    • https://atiksigorta.com/files/nibusuledapukijuzuwelarik.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zesejeluseruju.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/xagesaku.pdfIn PDF document text
    • http://cga82.com/admin/File/55042495813.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a096a0f3a3d---14992151231.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/43fe583f07e21203958543b19d378f9d/zasanefalole.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fea16b09531974101616c3d142c2b197/xawunumafezibekuzus.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/gujaremejeworoguz.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/takig.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///zapatatofupovanamuku.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/16714845639.pdfIn PDF document text
    • http://arslanemlak.com/E/file/34123065108.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5iv0598bae3otq1nsv6admbq3k/87042168693.pdfIn PDF document text
    • https://visualarchive.bg/files/nawiwiginukinevulovojalak.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xepiwi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/weraj.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/maparugirijipodofib.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tabexun.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/27216907553.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/79994072303.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/7783989088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+transmission+cars+and+trucks+for+salePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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