Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5901fe09f24bde1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 02:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d06ee91b7a3ed1c909f3e6a56b89fb2a SHA-1: abbbcdb32d55eff18f9034c7f9d1419cbd50bb45 SHA-256: d5901fe09f24bde19bde63af526be20d59e927b1c4bfe0278d7035c1e9a9b751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection further supports its malicious nature, identifying it as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://at1-turbo-j3t.com/contents/files/xabekofulurenoxiw.pdf In PDF document text
    • http://capmar.eu/userfiles/file/kizavipekutixejid.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/daxitibigagukipakene.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280251412928.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/feruvosiguranipobegu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/morixuvemofi.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/81850264810.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eff8ad7585cd7ec5a8b375a664d07ac9/57424787323.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gopegipawixebosagonudojud.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacd369d915---34997531696.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/030502008010.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/11062336540.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5c795fb857e7233cc59285ee5241bfb8/34630428457.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/29653067880.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e342fc0cb3---63782919217.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8ee78811c6942e3819f48752afb08ca5/66252639929.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9neosa90l67g908r0kr73prjh4/duvomezasukew.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/35013570411.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/13830537780.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d41de22---fobesiga.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/67f265450cbc4eeb9dcd437e86397abe/libivizidivimobamajakeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bocio+nodular+toxico+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_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10568 bytes
SHA-256: 7b03ed0dca4773d59ece254a220cf61720dfc98f230f977a96e00dbae23f6f98
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 19904 bytes
SHA-256: a53c7e63d46888d1b593cd947808cbc5b96f02fa78a68d1682a5286f44e28eba
font_02_sfnt_off00012b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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