Malicious PDF — malware analysis report

Static analysis result for SHA-256 6205c945dc07f63b…

MALICIOUS

PDF

68.1 KB Created: 2021-05-16 19:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d808533ff2e78388d30211b7647b97 SHA-1: 835fda2ecaa23d2f29808b83f5e64e71d21df326 SHA-256: 6205c945dc07f63b42aa9f1f5b9530c0ec06d7266e6b80f6172e22001d0b1524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed1b9914a---29419847232.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8f81e94737aacfe9d7056bd19dc735d1/zoloxedisuv.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4a9119f4ab62147be7d65c92c7df21f7/putakedesukubogufozejikot.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d6da1c58aff82a161f59ee00ec1165c5/98882104955.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5feb6f9---78824608880.pdf
    • https://aspaeng.com/files/image/files/semoperi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983190dc5d9---63546179169.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qk9ifu6b6prr9pa6hanboicge3/somelo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qrdp242vviq9ct6b2d7nlc1eo2/dinem.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a207a4c78d---63333507207.pdf
    • https://sharadsangam.org/UserFilesTwo/file/rezakazuxozikonuk.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b783938928---60377495801.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda96edb2a---20616843434.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/554medr8i0pce4gndg67t336fb/gazisujuxubatizasiboziwed.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071110bd6d6e---gewexapu.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6aed48f173bcefa2015e2e3443cc938c/86903167515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+skin+template+64x64
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d182.bin
0d6479f40bfa92c103326cc483f90e12930ff1237d86363cfcacb73e95936902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5540 bytes
font_01_sfnt_off0000e462.bin
bb975cb611fb58e78ca78f8c2af83e9c799dc667024a0f07be980e416b7014b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10476 bytes

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