Malicious PDF — malware analysis report

Static analysis result for SHA-256 398b5acb15cfa0ef…

MALICIOUS

PDF

74.5 KB Created: 2021-06-25 20:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bfa9f56f371f5609adb48f832e03afa SHA-1: 073bdebab38dc254ca55fda437b0e0a757c714f9 SHA-256: 398b5acb15cfa0ef6c0ee450700060aebc2efb1d6a1abb90837f5c25a5ffcbbf
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links points to an attempt to redirect the user to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8b6470139e70933465a3ebfc0258c193/peramiruzifapapepevevan.pdf In PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/25786406404.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/38641103663.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080964628514---33300675239.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/680595d9f711d1354282e80c50b53048/vutubo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088042600b40---tujibabuvagugotutukaluko.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e04718ab8---sobakefesidafofogir.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/56e7c4d9db64ec7d5bbffc185bd7a95c/31585619722.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/voxujepuzolivuwajetuniku.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/bujepik.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052607352748.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/63be29cef7708e134b7d5fef1a147eeb/tusajajufebisorufuf.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/nezibotazazarorizibumo.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/89631109628.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9e5ee6d8c894851acb639b9e58b29556/rurukineki.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9ad39f39ecdf5fcb93b9e84230b30cb3/giripunanofexuvu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cb8d62eda845e62bd2f86184b52259f6/96634744428.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zatowomudu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bb7b52f0---98771203780.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/54850989126.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e936c7d78fadd9b1de544867151b9456/biloduz.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/kaxunet.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2ac85e9a1fa7a9a6cacb4b5a134914bb/58893440930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=after+movie+online+fullPDF 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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 16208 bytes
SHA-256: 05d5ae36c7423bf0fe08c96cc24dfd39e0dec6ee68ebbadcffc3a3a54861a867
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10192 bytes
SHA-256: bb9da0b6c3c9dc2e7d9471496ba46e2fe681cd36a77ebdb959c7ff4a8a670adc
font_02_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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