Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b41138d4be4f87…

MALICIOUS

PDF

75.5 KB Created: 2021-10-04 02:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b79330b47b8b5839d68f2c4900336265 SHA-1: 8a10682c853159d459470632afc095aaadb245b9 SHA-256: f0b41138d4be4f87b35de0df8f738ebe1a65696cc7b636f46664ff12c00dcbee
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress uploads or form-handling plugins, suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://princeverma.in/uploads/files/31204184353.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dca770d1e7---rogiz.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fiwamuvovupazedelasiwako.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/bajeworewewavonexexopu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ca7d6992d9b5d9be56acfec306897af2/96417504601.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157f827a8047---laxowawegorib.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/ronunasut.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/powovozap.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149095f7f921---zinasizedupugen.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/16543430206.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/37412031699.pdfIn PDF document text
    • http://balone.net/_upload/file///65950912778.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/12999581307.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/84147346364.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/21958407293.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9jm5a56kkuohs5iim8g5nvvnm3/50516375316.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/7144595956.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/29090870304.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xegagapapexelizada.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/lasokopifavadi.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/99281631545.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/jibotugixudataxu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/filetu.pdfIn PDF document text
    • http://master-vin.ru/files/file/segub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=every+praises+to+our+godPDF 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_off0000c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 17968 bytes
SHA-256: dc6147aaeadceb4027d54f6d14cdb89a9464bb7dc37d53665b07726f3e346157
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10680 bytes
SHA-256: 8ad0ad79f2d6f468ec43cf764bad17f89fd6018250093a5e7fb8acc17b1870dd

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