Malicious PDF — malware analysis report

Static analysis result for SHA-256 9714302424a170fa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 23:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3ce2b1cec4a3bd6ed6894a097574aba SHA-1: cdd5d4d20e57ff22f7f7bd489abb1eb9bc13b154 SHA-256: 9714302424a170fab2ebc4fa84200dca7d2d3279c764ec42532fbf637dfdaea5
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 trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm designed to distribute malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dragonera.cn/admin/userfiles/file/radajilalebupibufa.pdf In PDF document text
    • http://netmutum.com/userfiles/file/91901166504.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/36518044811.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/panatusiwes.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1815b314---naxudukezavubugusigato.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/76237123861.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/bovizidozilelivasovugika.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/kunokirusi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/18238408100.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3b66784f370bf354261c7fa3a66fb591/17061291516.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mitewe.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9810df9f755a780f499fea22f4f7f550/58955495938.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jocud0andeacat3naevtuvmas3/59404552478.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf502499---51749987542.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zezizid.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/basafedovarepotuw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080271490f19---821188953.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde6afe668d---87897698433.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tedofinexo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103f1644077e---pemadidax.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/rawurofolapusox.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/50095266911.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s2pditef4e8t28e2b3av16ipg1/23362711629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ch+digraph+worksheets+for+kindergartenPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/mebeguw.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10940 bytes
SHA-256: 68b6962e37bb11181a5afb83e337d0e203ee9a3731985fb78810f991c5b0094e
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 18656 bytes
SHA-256: 9206a7e405f1f2497352a8efffcf3304099370618a327b9c7eefb5eef4e3c82d

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