Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ee38d6fa30b176…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 21:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5152c23bdaf69edf52d8e7cc229495ac SHA-1: 804b9ab4203ffb8ca47a73f844f70a59d7d37477 SHA-256: 63ee38d6fa30b176976342c669805c53b10be10df91739f62507dc7aad29b4d0
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' in one URL further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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 https://chcial.ru/uplcv?utm_term=qr+code+generator+mod+apk PDF link annotation
    • http://wsp.pl/userfiles/file/30265665890.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/70617461766.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/monadoronisota.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/15726686707.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jatozupapisesameduvas.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39303617261.pdfIn PDF document text
    • http://riph.pl/userfiles/file/xireji.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/misage.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/33748043752.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219111746312654.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda051b5d9---66950237878.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/30982443895.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/38344248320.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/besigukewurevudimid.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/25997765765.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903103604.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1b800cb5---49548003071.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/22030433446.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/werab.pdfIn PDF document text
    • http://micruts.org/userfiles/file/kiloxugokixutanugitir.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/45ddg6e6nm6ao9gqpsj072088c/zatidim.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tatitimipoluwijepita.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/mimakudakikimefok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10700 bytes
SHA-256: 20c6865c73e3c9beb2ebbd7daf647297ec8b174f360539589b8f3b973bc6d720
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 19300 bytes
SHA-256: 56a5548efe2b38c66fa7fb2d4c4191bbd3fb7fab8da12a8eeaf76f72d72fde92
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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