Malicious PDF — malware analysis report

Static analysis result for SHA-256 526c0fec49601ff7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 04:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f939ab264a378c1930a48751d4562122 SHA-1: 7d800aaf26f893d9bad4797b16c741fdadf2bb5b SHA-256: 526c0fec49601ff771f42ad7737d310ce15743f55ce8a0ff0b623f092b45ef18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, with a high confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://chcial.ru/uplcv?utm_term=talking+hank+mod+apk+download PDF link annotation
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/82304073691.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/29395566317.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/20162715640.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/lajadafadufomaze.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/wejufigefogimakaloj.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/53956208424.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/41918725662.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133769dea031---zatufuf.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/gupujabi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pujidetilebovas.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fe049d12---776494966.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/tekekukiw.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vetadisugakexi.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/kazimukiniripi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/9114676421.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/43973042555.pdfIn PDF document text
    • http://93564497.com/userfiles/ragelawovufamotatef.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dobarupusivebujikaw.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/donoxuzof.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e028b6afb999b94057a9f9af1f844020/59853975824.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/rexirunuzozojesijokimage.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/29114247540.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/57760223453.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/62147648814.pdfIn PDF document text
    • http://dytac.hk/userfiles/40431117356.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210922_92383A07BE8C73B3.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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 15860 bytes
SHA-256: 4509265ef78e51c7ebc59b6cf6c995b4bd6f0cefd95ae8d61b330d8387d463fe
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10480 bytes
SHA-256: 9f48491f7db84308c6ae25fa872ea82f5938cdeaf08a4bf75e094e319f8eeda5
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.