Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acedd3ec259e803…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 16:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d92b6e8c0a0339c9240ce03bc6f74e3 SHA-1: 12cc38df204aaada3a9b9e5bfeb13b7563484278 SHA-256: 5acedd3ec259e803c2fbb5b5aa56fe0b04b11cac08450b2cdd916b47b72deb97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://angelascanu.it/uploads/file/muxafezenogolawinodu.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/64391430693.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/32128383061.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbcfdb440---dipiposubetuvurapis.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/pumulumevurazawusibiteto.pdfIn PDF document text
    • https://nasikampung.info/contents/files/31705396607.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5k26hlrljoc1ck6mf113974hfg/jixomajumowomojon.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630790541.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/24365544453.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/40986914044.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/18073059758.pdfIn PDF document text
    • https://tl-systems.hu/files/files/78351979047.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1c3b9601---81902719540.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/66997941691.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/donabusugawiwebuduvapa.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/gurofogafika.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/288663120.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/45778695273.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/91369832929.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/46361975266.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109050354148320.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d13988bc---pawuziduloxijabojevanomej.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tofowadefamew.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/tajavulukixajovexuregew.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/28468045714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tower+defense+generals+td+mod+apkPDF 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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10892 bytes
SHA-256: 9de696f06a9368a99715543c52d50d4241f8eb6c5e358df99d4d4cf5a19d87e7
font_02_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 17468 bytes
SHA-256: 68f913c4b02d6352bacea4c63e75cc496aad73d850de48cef101431dda11d306

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