Malicious PDF — malware analysis report

Static analysis result for SHA-256 89653f5e71f62f71…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 12:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c5b7d7e27f42afe92c424f540f54684 SHA-1: 2d13a3d004fca27583a1973977ca2bbf41342e5b SHA-256: 89653f5e71f62f717fe3d0ad2cf0bf16b77dea9d8f59e05653dffc3b217ddfcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection scheme. The presence of external URIs and the nature of the heuristics strongly suggest an attempt to direct users to malicious websites, likely for phishing or malware distribution.

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 http://esenkardeslerinsaat.com/resimlerfiles/gulikomosor.pdf In PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/91711094476.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb655d9226---jokinobuzujelox.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/fabedotisufetatiso.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/7159509566.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/47440888532.pdfIn PDF document text
    • http://nscenter.cn/upload/files/kulenivukimavozus.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rofutod.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/38757548799.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/94936579803.pdfIn PDF document text
    • http://samtekelektrik.com/files/gixidadupos.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377d06b025a---titipowudorifu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ab7391e4---logidudiwatinalano.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/70139938412.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/34029820114.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685052249d---kilunuxubaxupuresuregaki.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/90991635220.pdfIn PDF document text
    • http://valeneighbors.com/userimages/mabigiwozumotobowerod.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zuxorelejubijabimejovim.pdfIn PDF document text
    • http://chinazzjx.com/d/files/50995412027.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/24483810020.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138215131ad5---21951925259.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/8249019331.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kileweronogopozebow.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/81603332338.pdfIn PDF document text
    • http://mestan.by/images/file/30502285279.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/1829479157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=doterra+deep+blue+essential+oil+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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 18640 bytes
SHA-256: a8b4c717240c1d84e5f6809288ea94847ca217f815583f2bf60f8e09d5b136ec
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 10732 bytes
SHA-256: c7190687dcca7207e5aa69fb82084e5b03628988836e859fc1727082f8242ac5
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1