Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa52a2580fb635e2…

MALICIOUS

PDF

101.1 KB Created: 2021-06-29 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86286bd645197fd4e45a06bbfb1e6e45 SHA-1: 5e75c2ffc6513ff2deb9d7c143e75c49ca5bcb04 SHA-256: aa52a2580fb635e283403543756389ccdc67b85c20d34876b563cafee9f2c8bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URIs and link farm heuristics indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f62f2feced6b282891ee1d51cb3f7e24/67000034615.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/af9f3884962986cb349de988bfc41584/4694390797.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/86613611109.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa57081b7---zisibadonaxuvepapava.pdfIn PDF document text
    • http://charivne.info/images/file/3776004993.pdfIn PDF document text
    • https://birudongker.com/contents//files/45918668347.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8ab3bc7---95447119863.pdfIn PDF document text
    • https://kueapem.com/contents//files/70080231052.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rinutuxu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04abc9ea---gafokifetevaravi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/lkj3hvkjiafijiad59s2bgmdmh/jofudufotefo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/800cd95d8ea3213dbbd4b4ecd7f45675/94327299822.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/danofarezobadojepogi.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/16432046169.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/01aba88feb2723507e62ad6fb3b41fe5/3585953041.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/libegesoke.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/aimqme9k3ncg2jfkikbv9vkucf/nafenawitu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17e9c9509a---40045061617.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ek92l24d283s737rp1rtallhu/febegosu.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/renejisatozipo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/91569154456.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862bcf1a32c---pedivubekekujubewobiji.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e24d174a60c6625df1f007e749ce7651/44301036145.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/44695254363.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/23527801324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+10+science+chapter+8+notesPDF 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_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 16628 bytes
SHA-256: 6cee844e8e3e63aadba01981bdc38cff79a8a1d3345191c2aebf6b2d9008c8f2
font_02_sfnt_off00016d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D79 11024 bytes
SHA-256: b9f12c8d7ed2083704c87dea1e5c94f9295845691561fb34b76b131d2e3a000b