Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ccf73ca5db5876…

MALICIOUS

PDF

82.2 KB Created: 2021-07-02 22:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c26eaa4e58ba326f4fd909dc748a2bd8 SHA-1: caca6b7fa8f28287a2ede70a882ecb448fcfd49c SHA-256: d0ccf73ca5db58769e71060cb41e12d562a8d722b74b1a11407a3185299e7239
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a malicious phishing trojan. It contains numerous embedded URLs pointing to compromised websites, some of which are designed as link farms. The presence of a visual download button further supports the phishing lure, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=rick+ross+rich+forever+download+mp3 PDF link annotation
    • http://chickendaylacrescenta.com/uploads/files/13199546769.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531060606_1655902780.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a67502e7e754ec175e820288fb33a046/31906776700.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b105cf428---gabusutuvegofunotu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/benilivaxarigen.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3bcbe25af0f9e0ba59997808527061ac/gakoreno.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/94739616403.pdfIn PDF document text
    • https://faprosid.com/file/96671368131.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1b38b5d9ac86ff19e88478b01bac32c9/jofogozutugox.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/km6vh58fakmb2gcll5ojce0ube/49748678395.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/1655970941.pdfIn PDF document text
    • http://unityproductions.com/upload/files/20620190759.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5erpc122h1kt2msd9ehlo1mbbs/bazawawoverikaxaxivetev.pdfIn PDF document text
    • http://texmet.pl/userimages/file/76669845032.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e19502c45---xusiguworemo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0159e25a3cb84158ffa9cd70e92ee981/puxok.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ffe4af78a64f64683c916d885a82c399/letavalavagasowubixete.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lowusiselutesubodibabopu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815205c2f4c---wewavibesogasanozide.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/88828299703.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/xarakizowedilamar.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/katonaxokekivozu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_01_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17184 bytes
SHA-256: 8b66b4e8d90e8cafb6ae33d5738fc3c2065f05e838c05ceb7a66e3073a37ff78
font_03_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 11248 bytes
SHA-256: 2734b32dc930bd32a86dffaa5cdc001e61fbe3066d087719e547eb75791339bd

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