Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca7f1c7107084b0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 22:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4c8975cc39c5cbeeca0b22342b52b528 SHA-1: 2786fb1f542fb51e26f9d7057ec47a15ded9433b SHA-256: 0ca7f1c7107084b0e3d3b26b3bd576d62f6a72fe17ac8e4fb19025ab2da18a34
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 0.9953

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://dade666.com/userfiles/202106file/2021061418530270554.pdf In PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xexoriraba.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db99cc112---raloxolafezoti.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tumededefidubuvop.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/79fb064bf20ef1e7f7c4fb44d514994e/29780216572.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/54240025854.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7804fe93bc---5734898520.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gobelatanopamuv.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/norud.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ruluvizejup.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/vivixajujuwo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca9d51256---71974137960.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b5043d7f6301d9703ee978274359b8e7/japutomepomenige.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/61303635662.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/sedowojevepagenelad.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e6c1b00d4ac1e890e2e3e80c593d2018/gazexudazuruwakujalorax.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97824d4b82---widiwuketibowibenujareko.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fotukata.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sevisonufamulivaruto.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/27e3acbb83090fff2e7dae10d8ffd23f/85271336427.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e97b10fc8---95232989884.pdfIn PDF document text
    • http://mldinsaat.com/image/files/vetame.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f4b01198bac262dd3729ea5eb201ca2b/36553216537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=surah+al+baqarah+full+pdf+downloadPDF 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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 17964 bytes
SHA-256: 48fabedad005e3307eeadbfe713ae0a182ef3e4929249b7da06d826578866685
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10652 bytes
SHA-256: 70538059dc218681ae24b66793adafe613df4f1e5f7c0eb4f14492371d314226
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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