Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f437f527a871e4…

MALICIOUS

PDF

104.3 KB Created: 2021-06-30 10:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 033404c70d368905ef7739c97072d7a3 SHA-1: f84958e53f5748529aba236874f8a456f0b3cb6f SHA-256: 78f437f527a871e45154011be1535167b760b3642cc1142c8b9bbd7666585ca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://baugeraeteverleih.de/benutzerdateien/daxajixoku.pdf
    • https://nepalimodelagency.com/userfiles/file/woregarapozesotobejowi.pdf
    • https://damsindia.org/admin/uploads/file/80038815017.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de91257d25---fexobitiluxetomeg.pdf
    • https://soechi.net/userfiles/file/37953980341.pdf
    • http://hzjksj.com/images/upload/File/19477204410.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b2534150e---fatusalovugidugexu.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/897a22674d7743a5dddcc3f4b2f291a1/xofovitanawiw.pdf
    • http://mywayrtk.info/userfiles/file/xenina.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efad631b6e---43337140015.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39a27e0f3---zigajulefawomaf.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q52h7bgge2mkvj1sfktpt84j9q/kobilisuko.pdf
    • https://carrieres-pierre.com/userfiles/file/sadikoru.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7edk7embj4gsfhuj5glj5d0ujl/63760592223.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09addc662f---risivuroko.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b538550c6---29063681026.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb157a832e---nefitug.pdf
    • http://proxima-design.cz/files/file/nimivefewemerofixuwem.pdf
    • https://blindnow.com/userfiles/file/terugoxuxerusopekapav.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d16970723---28990080012.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f04b082b---saxifurutu.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acdd6b6e46d---31681757276.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/nadewilaxexev.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bf518ec02ac6b23da97f74e24b52268b/71252734801.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/fc7e1db0eba751ec29a1253bed9cef4d/47801765390.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=for+your+review+and+approval+synonym
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016d94.bin
7d17889bb15ac3b825d74739dab8d778edfdc75a45411980a30718d79a9afef3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16D94 21640 bytes
font_00_sfnt_off0001075a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
font_01_sfnt_off00011f6c.bin
af38b57e30dc6f355852951f2aa9c54aae4d7b191901fde7c9c9dd25bcf64be5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 20792 bytes
font_02_sfnt_off000154b4.bin
d06eb29dbb3f3152baf5ad5dcaa7d79f001cb07374b4d1d067e9a6d4b10fc69d
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B4 10800 bytes