Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4f8e5b3db7f390…

MALICIOUS

PDF

90.3 KB Created: 2021-08-02 16:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7496fdca0d9543b992c11e84cd8202a0 SHA-1: 0aff66c798c379a0a329f84c90a50f7f66d31a6d SHA-256: 6f4f8e5b3db7f390726a199e89288c9faf296115987aca6704fb2fee37d04743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which appear to be compromised or hosted on disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=what+is+the+saying+blood+is+thicker+than+water PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d99d669da599185c1fb1a47713beb0cc/93178895183.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/5740757753.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/30758867020.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/59467319840.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/nikin.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ff0476c9---nomodolik.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dddb7e75d---vutuzujipirebovola.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/77060238885.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wavisirajafu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/44726041756.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9f8a9e81---gaxotezimopefebipamomuvot.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fefqm60qrcqt5ejdm837656b2/jujokokawaval.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/xilonorakarex.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/susidodudakemutojamonupe.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/vurejeme.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/21f3e36646872bd89b8064bb0a874766/31538572955.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qu31kdj4v7nbveo5ita690i004/18544567704.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e558484b---48271417412.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76034406406.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mk6la5flg17k30sooinc4utnj4/51632517948.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/duxaz.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97e8a331aa---linezajodugonatokogar.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb23ed2d42---tajibipofekak.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d2269f598---lefaxizonasukuzulozur.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7eda595662a78f73695915b3893afc39/lagidozex.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/29082421017.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/jibolirezevuzabexewotike.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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 18016 bytes
SHA-256: caad7f16b2867b953e817308949b50c84e3abf5ef86ec39dc46ebe1765797882
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 11076 bytes
SHA-256: 27ebfc783a3a362ed0133ab3eaa49a882de3b9fb5b09efff901d7011509439c9

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