Malicious PDF — malware analysis report

Static analysis result for SHA-256 be64021c05ce873f…

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 13:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4300881cea9fac9cfacd093b302ca941 SHA-1: 6907f7b31ae4025926726defbc657acea41d0a88 SHA-256: be64021c05ce873fdcbbd55db4916f236b8c70c8d4b4fd8bcfd7954c277affa1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://originalcheck.it/public/img_admin/file///salolujofimu.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf30e6e021---43862898106.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/91771155113.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/14621177586.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/5b7953bdf921919e787af5ff2aace17b/vuberuburowatulo.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/fisonigibazariwobik.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/mutifunonekugami.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a818b8c2---59319267089.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7a28c7a93da65a07e9edb205e8dd03ec/vatutakaxi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7ojnqdkk04a0sdopu233stnk2/32728407345.pdfIn PDF document text
    • http://wernitznigg.at/files/zijik.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0bf893d3---tejarukotonomu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab2fe65de---zumerajojaravuvoke.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/guwadim.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/11028684804.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/jepejonu.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/fogaxoxobebiwafakomunik.pdfIn PDF document text
    • https://kede.org/userfiles/file/wexupedewidom.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace3ac5492---59991901657.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/c5dsco3ffgsm43qadu6d01fbs9/digiwujazowoxubovusaz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5a0b1b73---5143147498.pdfIn PDF document text
    • https://unosms.us/userfiles/file/121320681.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/jisepumutixamuzigegapono.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/42359183054.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf653247a---betojejemutewobijid.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca9c797b55913de666a1a41029dd39e9/xunuposa.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/22513694499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=belmont+university+map+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 19352 bytes
SHA-256: 6ae8a358c81dc195839e3bf405162b527f1d61030d01499cb02fd827a3e6cf99
font_01_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 10992 bytes
SHA-256: 7805596b7d90708f0d41fcb4de691579283b1d2c983755d9d5998803c0c8857d
font_02_sfnt_off00014c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1