Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eb76935a8ae693…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 14:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 340eff442c9b119e4f66a434266b21d7 SHA-1: 97a68b09e1f57a34a7655bdf70636368095c9e61 SHA-256: b9eb76935a8ae693612153847cd5c81617eee23fdcf69af7e912a0495cfba2f4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://asmitahrgroup.com/ckfinder/userfiles/files/wirezugozedowufarigipeza.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/leregaliwirefikumebuwino.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/gogapemosaxunun.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jexigifipivibi.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/68516903217.pdfIn PDF document text
    • http://nanopena.cz/upload/file/20522869792.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/694eb7d798cdd27cd13b3bb380dbe0dd/sikowuguwazirumowufizula.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140063ea3834---54177233472.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/xefatofeboritavexejavu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/gutipuvotomar.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/puxotadasolo.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/64974758744.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/xovesipafasam.pdfIn PDF document text
    • https://gangnampools.com/contents/files/146153637.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pefurusumukigekosotaj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/b52a1eackuhoc9n4npe2pc3e15/ruxujizukipakexolafarobi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/tikoludumijo.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/18760112562.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c966dbf98e---28136813040.pdfIn PDF document text
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lowubabididibosuruvep.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75adcd429---87733375541.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40433668600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=qr+code+app+android+testPDF 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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 10520 bytes
SHA-256: dd41236a02037001c9fe21e8b60321401ce262f9b22a461cc36c313b7b166bf2
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 17756 bytes
SHA-256: e067f5b46dac033c0811e09b09fb103229fc1853c9534caf29a44befa1648790
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1