Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8b5110202ea4dd…

MALICIOUS

PDF

111.7 KB Created: 2021-07-02 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 697c1720b252aea5db73b0afa43bf0f5 SHA-1: e3a7f235971120522c4ce14bd36134bba6a58cc0 SHA-256: 8f8b5110202ea4dd5af8771c25374bf854a5ab9f3891deef5d9c4681e4782070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://wastran.ru/uplcv?utm_term=from+the+stable+of+meaning PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d1803d84465a51681c1dbd6e66030819/fudajoxedanomoxasoluvanuf.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607de13101314---jovibisigeviziniku.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbcb0e7f4---vijefowofovibanexajetagu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4drbl5e47kg3ifi0tujsaujeh6/22061830165.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gb68j4vapknmfont6v35270e8a/20688380530.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/repesuwumegewofenaser.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3c26c8c9---17169909629.pdfIn PDF document text
    • https://arerp.kr/data/file///73197915216.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1e2e5706---fogan.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/kesewemimokafijusesijope.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608526ed26360---dofamipuzovujid.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9debce875---58386587989.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14511453af---15130759294.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9499491bf---48904686183.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///delirokef.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/16429286821.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/rujepigejamifipolejibaj.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/76150943247.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf8d117144---deberurarativumewel.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/60203762173.pdfIn PDF document text
    • http://www.centralperdana.com/file/rirurufaxipiwovu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9c2cb7d96a45fc8def9ba7211f1f2342/13487496703.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qv78ead7ccfl3ngal66pfaj702/62757526437.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad7c1755e---92115785063.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/tijid.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016672.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16672 19880 bytes
SHA-256: dc07d5c1e451ad246a6c22566c4ed6bdd4ebda08903e9673a2ba3909315c1c76
font_00_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10776 bytes
SHA-256: 3d52fc94d13f7d375aef6daba3f2854067945e590a047ad36787d182076b743e
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 33508 bytes
SHA-256: 3a90d4ba2edc140bf097fd231064748253d85891ad2c27b724ebbd24ba9f4856
font_03_sfnt_off0001888d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888D 4300 bytes
SHA-256: 5bf0fe32e5b9e9d3e2b3856f8d6ffe0d165c446ceba8538111884164eadb3a9d
font_04_sfnt_off0001988e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1988E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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