Malicious PDF — malware analysis report

Static analysis result for SHA-256 7644c43634ef68d3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 18:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e168c89f781f53496bc31bc30e312f92 SHA-1: 4f026c38c1cb6cd077eff34603bae79b9fe9259f SHA-256: 7644c43634ef68d35a3280a23b1aa486984f6fe168b31118f49ad053571a7495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://eggtesting.com/admin/uploads/file/gurosixu.pdf In PDF document text
    • https://chezgregoire.fr/userfiles/zonubolinafaravewovuku.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7b20beb3---gixosejikokuxedovozopasu.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/ziwovokinalomomer.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/60381126566.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c13e2a82ac8b4c676745eb371ccf124/55312686765.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zosatewimipibubixufit.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/47791849050.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ks85qin67e4gdo5bh9iiesh87h/10028976811.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/30525143713.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613606b982ba3---regig.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/80118764624.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/gafama.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f37fbcb18---kokusazeranorananixanur.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/50867675953.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/87556591852.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zumejeseverugupomunafapid.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/federewexexisezazuvurijal.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/72756065224.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/tuzoraretoxipojekazif.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d457bd1ec7dbb63872cb8d494ea89a02/52087348267.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/56577684304.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142342753c8e---dojob.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210916052329_1678851312.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/xokogozewit.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/85442002324.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/keduwanitorageduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pes+2021+pc+apkPDF 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_off0000c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 17912 bytes
SHA-256: a0c80ed8aaa74c34962d7fc9dd821320a2d7a672e6121283d5ea0b70e3881563
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10196 bytes
SHA-256: 18d8d9237a278503afd7f0fad6e5d0b8b06ed0c6e40f3a343552e1f0d841966d
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1