Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3093b3f82014b66…

MALICIOUS

PDF

153.7 KB Created: 2021-09-04 17:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0fafc4b525e10df2d19e8eb87256b7d SHA-1: 6471ec7c4cdb46be950a9b6b4ed907f228a6ba19 SHA-256: e3093b3f82014b667dc948fb2331a4727eb9d6dc106e363964dc693be1f6e324
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/34cc2ebcc2d84cefcd9253ef7024faa0/pibimo.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201cfe0751---75389025550.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609877065ab92---sowivakon.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/tasixopizuxidixekanuk.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rulededaximi.pdfIn PDF document text
    • http://dges.in/userfiles/file/20473964108.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/loxalafaxujiratolopomeze.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/21502713589.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743310365e7---16410595472.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/rujezizikixo.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/sefomamezuv.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/qbq7vtkdseh9on62ssgfvkouc7/3457930988.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/06de7d58e5e232978e911748e985a4e3/vodekajitagimagudukog.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2530438f9---83880317711.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/56786369160.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1339d370f---vapojuluga.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/04b2cb08b84affdd96b861e37ef4824d/tenop.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59136628725.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f807ba7696---vofuxumitorowikadez.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6ab142e8d3060a27991325c6ed9eea1a/mavarobebutenubi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe86d341d---zevorupuf.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/pesajomisoduwaxem.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/kifabe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9a1f3c38d35eee1bb4336362eaea6966/majibewuranavisere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=economic+development+of+pakistan+notes+pdfPDF 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_off0001f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BBC 20028 bytes
SHA-256: e84c6ac85b6b4191b9532839291d8f5cad0b5fec5c7a6ba1ca7657a62413c048
font_02_sfnt_off00023fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FBC 10824 bytes
SHA-256: 940e36b2425a3d9e7c7bd7b9b417bfe58b899ea35dfe2696afd8d7a570b90a91

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