Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db9614c7f75af15…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca120490a427d058f732c38039083be6 SHA-1: 3d6bed776ce8432b853c925884ac9f73bfbfccd3 SHA-256: 6db9614c7f75af15ea4c9a72f8a07e9041e3e9ea6eebd2d0cf7f93a9257eda3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://kit-veron.my/ckfinder/userfiles/files/38423109010.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2170325fa9094cdacfb4f0689c9e4cd7/teminipovusapumavedik.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/76898425990.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/bavedagukovumotafejategiz.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/54232213825.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0f0d9582fd9f57616afa43d998322c63/ripoveneja.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4526afb88a4bf44f30820b8226966bbb/985670229.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086175ddcd41---42130526108.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2b7ff9e4bd0dc8bb2353393e37fe816d/boxirusomolu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/71157124379.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123555ad105e---tigebunewatokizakurenifed.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2429de2fb9d70147f24476e1a00185d8/serazi.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/41438970078.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/giwilefibepumezet.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c87ceaf890b1772ddf2cf988eef8706f/masufiwezuxobuwetiwamuri.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c138f50e79b78c90b02b513cd9ee7e6b/zudirib.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce01f7c91f---37534194376.pdfIn PDF document text
    • http://boxethai38.com/upload/file/36242164013.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/zeweraxojedareferigima.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/zitukabawibu.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/63108575492.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/41556750497.pdfIn PDF document text
    • http://darec.sk/files/files/3204379567.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/11300464380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=worn+tenth+avenue+north+piano+sheet+music+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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10996 bytes
SHA-256: ed466e7b31ce5fa5c8b2cb424085d2abfdbdc02a56cabde426eea0c36eb179a3
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 21416 bytes
SHA-256: 4751c4858c11fb9c3ae3bf74106bad556bd20623ce4e66547e7ceab12446b815

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