Malicious PDF — malware analysis report

Static analysis result for SHA-256 a775f14a01b10d31…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 23:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b798d10c8f33841bfa638d6e835bd6b SHA-1: cc2ec1d889463942ddd4c6c1e845a57d3568e811 SHA-256: a775f14a01b10d3124e3497bdfc60373a26e17f887ca66d2f3ffc4ebe1a4da5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. 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-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=el+alquimista+impaciente+libro+pdf PDF link annotation
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077afadb48c0---68024673253.pdfIn PDF document text
    • http://mfahk.com/upload/files/27606688021.pdfIn PDF document text
    • https://kuepancong.com/contents//files/38431568883.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/sidekuw.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/tobelekosulusubajeviw.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/91346993729.pdfIn PDF document text
    • http://zatacorp.com/upload/files/sisawefepudujazapizumeje.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t6ngir6autkkq2000daba5vvl6/79845453086.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/xewudobuxi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/petadejemop.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/pofikerudabe.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/69914350049.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/dusiga.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/42927983612.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/36100288672.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cdde3714---86607153294.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a853673---17218019198.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9ee445e---30016915504.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jumulebenukiwir.pdfIn PDF document text
    • https://red-adlay.com/upload/files/witufixidixomipu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200937975788.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/94782096702.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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 11152 bytes
SHA-256: d1e57e853be64a6559341c94a16d5971d2a1dae1d8bcc777045918c7d3d9f758
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 16052 bytes
SHA-256: 6a8c3b72ab7b17ad11a650d5e8cf2e7c3301181a709d8deb835cdcab0f3ca0f9

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