Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7a7052b6db1676…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 17:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68e9dc6bbd612e44b5282f55df24ccc8 SHA-1: 425d196f916f3d5c7c1a57366b406545f8ce0d66 SHA-256: 7f7a7052b6db1676b6ada481ac5268098a347278681d891236ea3e46a9c975e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this, indicating the document's primary function is to facilitate access to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://baloneacessorios.com/_upload/file///487347198.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160809aab93b52---bejuxopagazasudatij.pdfIn PDF document text
    • https://t2sc.me/userfiles/rivawekipenotiw.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/suzekedowo.pdfIn PDF document text
    • https://hoalavender.net/upload/files/75607868133.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/bisininuduwilawof.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/32674448939.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/taxog.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pazeverokaro.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160777eb6487f8---95929635964.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/27vblf01rmrkp25l2h828tqjl2/23803778718.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6083c0e89c---kivoxuvudazijiwejat.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/83136525021.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdd289140---46473495787.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/04b55f2ui3nfhnv8lk46b9is03/kudunoguvuw.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/7434977878.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5d3338ac639699fb0500834e67ff6f06/47382321105.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f46f666bd---48113953137.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/76944267164.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/96189093969.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/19555979624.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lopoxoposadume.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/13821576776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=technology+adoption+model+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10876 bytes
SHA-256: 63dfaf4af2bae7e284b10d07c50ff3d6ee095784f55265e382a7fec1b4659509

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