Malicious PDF — malware analysis report

Static analysis result for SHA-256 3930f4d8e223275c…

MALICIOUS

PDF

92.3 KB Created: 2021-07-20 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35fcdd677863baeef81009b723deaccf SHA-1: 71f5aa05d9fdc8956bd6df6a163e84dff9c83b43 SHA-256: 3930f4d8e223275cb444841693dbac4de2692c372a07e6bcdd45465a65a21413
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which appear to be WordPress sites utilizing the FormCraft plugin for file uploads. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c957cc0499---palemat.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d89eeaa077---75691368603.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b343f16f898---26739909573.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609412bda6459---98054820416.pdf
    • http://northcity.rs/slike/files/tutuzififezaxejalote.pdf
    • http://otvorene-srdce.sk/userfiles/file/xupifabepuwikikejenogav.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b89e69af2bcd6e6748c81a80c99c742a/xabevo.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/86297172456.pdf
    • http://aaaexpressheating.com/userfiles/file/45225916802.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/42f590b018b732a45b1cb421e7a0e17a/zuwonobirog.pdf
    • http://fedoro.ru/upload/file/61588312553.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d8672f85---jedasewanus.pdf
    • https://techson-cctv.com/upload/file/98145834199.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4dad967c---sitoxasuzupi.pdf
    • http://beveragesgs.com/userfiles/file/7686135954.pdf
    • http://paillasse.hu/userfiles/file/nizakovu.pdf
    • http://zubrcup.by/files/files/34874664177.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cd45e992d94dcd13e3bf45268a92eda2/jipolokimexifiditafa.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d41145561---28642203181.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4qo8dpftm8mk8fe62og9j7cshk/samorakukejimogopuzopufu.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/316e756811c2c3f1f1d4224ee7aad36a/6661546424.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f90e77f9---burepifu.pdf
    • http://lateonsettay-sachs.org/userfiles/file/firigejaparodopimofabugov.pdf
    • http://jfe.hk/userfiles/24619371964.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=operating+system+by+dhamdhere+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_off000103ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
font_01_sfnt_off00011bc5.bin
8c84d639691bed157441cfc0bdfd5b8161a7f192bcdd2587739d0159ede8dbf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 11060 bytes
font_02_sfnt_off000134f9.bin
5a38b661ef73d46c57efad077b13cd7341a268888ab5eb336f124dd895e63be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 17780 bytes