Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc01b5b2389e6fc6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 19:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af1c7aabdb9c08f5e59bba81df1fd06b SHA-1: cb2970173418d7f619b9d8b00c1e983fa657d095 SHA-256: dc01b5b2389e6fc6c64ad85f023105fb9ddf8043a463ddb426b519be748b5e0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9882a4b0---demefabefik.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/pijejekezasez.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dikodorujufajuxubigotun.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/52933289227.pdfIn PDF document text
    • http://nakatka.com/files/file/15064433500.pdfIn PDF document text
    • https://poker-fire.de/file/95876221958.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/91971d2d789a9d6f04186998e377d734/putuzexoboturokonu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160780f758f0ba---51865746391.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/51307372968.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd975998a---kaniv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a9ac13b66df79819ccf7f0381c6669c9/83265347893.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/dapajibeti.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nrq49gdcv3jhqb7871bgjagsjj/81886942615.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210518005411.pdfIn PDF document text
    • http://esistore.be/userfiles/file/17521475399.pdfIn PDF document text
    • http://lawngo.net/fckfiles/30563064857.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec2b01bdd---24217836141.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12513355956.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/68732022866.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cde7fb9d90b6e937d58ea11105916267/46648487622.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/tivananumiwivuwagizari.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k9enfmu67a4cm7a1pe8nroqpg5/21328578035.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/20181531220.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/98417487912.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078707595df6---morevugotofe.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/finagimufefopotikofes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fridgemaster+mc55264a+manualPDF 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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 18492 bytes
SHA-256: 06fba949822b6cd1aabac36418be8e55ee580641d303c5e46fa8b266e26a2e9f
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 11172 bytes
SHA-256: 8eb7632e8412334e672a006ba1f59d91f50c8d7fa221124d554c64513e428349
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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