Malicious PDF — malware analysis report

Static analysis result for SHA-256 b434c9d7beb2ee53…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 08:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69bddb0de72544cca7cbf9827f1fbf8c SHA-1: d8eccf1c07d8fded4ee51ce4b84b83849057e877 SHA-256: b434c9d7beb2ee53014f210026639f626de52a1beb27fe5f8cc5d281eeff873b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=kyon+ki+full+movie+streaming', likely serve as lures to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=kyon+ki+full+movie+streaming PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613712073ce2b---jiditufotafalis.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/suvidigakonef.pdfIn PDF document text
    • http://gaudi.tw/upload/files/mokodivuwekuxotafawuxoz.pdfIn PDF document text
    • http://esipro.be/userfiles/file/35636794003.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090109112873499.pdfIn PDF document text
    • https://penal-garazh.ru/files/mitanuwe.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/xejutetuvekuxezivukimam.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wokelarojulige.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/lafawefila.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/jatuxunaxigudimotob.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/duwamozujejepulilusujona.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/98502321539.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/79607408734.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/69022858612.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/kefabagulopozadimigujeker.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/13572987268.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/44655728190.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/29747209657.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dde7ad124179fff6c48e72a7a5d0e2aa/14370751766.pdfIn PDF document text
    • https://hobbypet.cz/files/file/4335534831.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab31d9ffc---xenediwologega.pdfIn PDF document text
    • http://theponghop.com/upload/files/kolofozapuze.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/lefetilixijibiw.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/todojezinaranasibofujasu.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10920 bytes
SHA-256: 0ed9df9b422843c84f60bb22ed8d35df54a504fc79d113a27ccaafd95399e602
font_02_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 18616 bytes
SHA-256: 03aed0eea1482d83be67b74cb8b9e55abb54032fdc5562ea2e9f321b3d92282d

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