Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75e110ffed7ecf7…

MALICIOUS

PDF

91.3 KB Created: 2021-08-16 02:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e85e0baba4a9295c66ac6464c0dd4f7 SHA-1: 91af8e242a0f41e2e5d666bb658445e41dcc504f SHA-256: e75e110ffed7ecf726ea729f58e7a9479be3ac635a089b42a4eb85c0b4a88cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pjba2bgfum7m2lqndcq1lqcsqr/sisutabugelu.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edb57fa4d---16042088147.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9556a8300---99991350452.pdf
    • http://mintaialuminum.com/d/files/sosalajejugixegimepasu.pdf
    • http://hangtatmj.com/userfiles/62918800442.pdf
    • https://alatheir.com/atheirwsfiles/file/6957591064.pdf
    • https://beltamas.by/content/Files/semitabenegoza.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/94485683868.pdf
    • http://ascensionchina.com/userfiles/file/57671474946.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0f63b30a---mowipovedagibu.pdf
    • https://gomaihoa.net/upload/files/levebukus.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a338b8a69a7---vuzudam.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9dd71bb81---86937876974.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec33d92765---64196155178.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7190d560---41436267061.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dc91ce19783342367d42855840bcd267/fidufuzaxus.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/43769363418.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7864535---88834366427.pdf
    • https://securityguardsupply.com/php/uploads/file/malejevoxejegozewisego.pdf
    • http://vieclamtaichinh68.com/upload/files/46696612371.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9371c0bebe7e6ecf7cb50ea1dcf95872/78432313002.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/59962895525.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/78094684950.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dd2861c3ab9c7efe1462d39ce1f73b10/84046015089.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ecuaciones+diferenciales+lineales+symbolab
    • 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_off0000fa05.bin
421101547ab611fc5ec766e3e9b7d2bc90514030080c544965e01829d5ddbe4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 10876 bytes
font_01_sfnt_off00011320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 16792 bytes
font_02_sfnt_off00012b32.bin
ea35a16f816fbba41bb9722d965e2a707e0c93a9fd749c21f9f5f1999efc0142
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 19344 bytes