Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d59407d2313ab3…

MALICIOUS

PDF

94.7 KB Created: 2021-06-27 15:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f24b4276856f116b8141ff3a33f1e7a8 SHA-1: 646ff052b2ea3978f5ca62431dcbdaeebf9f597f SHA-256: 24d59407d2313ab36d21447236dd47e1765eb0a85e439123e14fa009f2168427
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to trick users into divulging sensitive recovery information. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, further supports a malicious intent, likely to distribute or host further malicious content. No scripts were extracted, but the document's structure and heuristics strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://coyada.com/up_images/up_images/43147040691.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fbc108bc---22883221811.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be929e22b85---kaxisoje.pdf
    • https://hgb.se/filer/file/44934771730.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cda2c2b159c---20923740509.pdf
    • http://gtshotel.it/images/file/66230477066.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01fc52ed19a6423045c22efd785afb5f/60873634545.pdf
    • http://castanienfamily.com/clients/74558/File/58053133054.pdf
    • https://fnb-concepts.com/images/uploads/files/tisenexarederipugizoga.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607687c7ba5d1---serup.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/xixawu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12e567e03---xozukiragagofixovunoxugob.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f4c2883---64755426820.pdf
    • http://myredm.ru/uploads/file/fakekokufawufusarogamub.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb93b105b---19952119425.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2998e0d3ff---sidajibatoxedelepoj.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sao4ga6rkl5ku93pd9dqgr3pv1/bigurikisadokotir.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecdea4e6b---4415680028.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92df3b008b56c20491040ef3230c6369/nexajepijo.pdf
    • http://a-kamen.com/userfiles/file/kuvulodazotogasidimose.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tgivd6d74teh4adfb74dq0vah2/robuzowutenobexub.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc0785b9d---93171097868.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d66d7e6e26cb9d1c6da7821b6b5cd788/mabujusunuka.pdf
    • http://hrt-foto.hu/_user/file/74914206580.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=grand+summoners+one+punch+man+tier+list
    • 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
font_00_sfnt_off0000f997.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 16092 bytes
font_01_sfnt_off00010edd.bin
da9de6dbc7fec32e07bc0841aa9df7504f1babc85285bc18c60515ccae82ed02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 10920 bytes
font_02_sfnt_off000127ee.bin
622a8cfa09c772ee53543fbea0e29087e01e749ac7d7d5e89e660efba1f95c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 17100 bytes
font_03_sfnt_off00015497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15497 16792 bytes

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