Malicious PDF — malware analysis report

Static analysis result for SHA-256 e178ae650d1d90cb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 08:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 030172fb3b30e6673affd3469dbb1fe6 SHA-1: be3b00f12212bbf8030aaaf26ecf1ce0075445a6 SHA-256: e178ae650d1d90cb600d0f71bcaba85ccf157c95b96225fd71e16f652806ee4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.chatanakonci.cz/userfiles/file/gowobibesizedixuvopeke.pdf In PDF document text
    • https://annekienlen.fr/imagesfile/pupelonofajamemipesejev.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/50946160342.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/64567453146.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/dojitu.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/42628605343.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/risemug.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998a490ab66---16651492951.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/59329066144.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f5e73959---gurawuwukatoregodekuguto.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/68749423143.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/4168926753.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/81262135069.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6d7a9a94f227ef788f4863544bdd26be/lesebokojodusewubulav.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tu3sfclr5nu5vc1e93iftet19e/81302298191.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0eb6d83c292de31ba60b22567ac8759/tazujukivoxetevaxo.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/19117733677.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/dapedixupireziw.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0146c705ca---kozokirapubum.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8682221fb8cf8563a93cbb82b90fd7fe/fapozol.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/nesevasov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=other+others+another+exercise+pdfPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 17368 bytes
SHA-256: 66ada64304fa945d521a98fbab82998cbeb9db0b73be6724e0d76867118bac40
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10796 bytes
SHA-256: 402e505920a53b628b8253ade57f16b113741a9eb54a0eb01e39ed408454a3d2
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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