Malicious PDF — malware analysis report

Static analysis result for SHA-256 4001c4b39263236c…

MALICIOUS

PDF

85.8 KB Created: 2021-08-07 22:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 651ac229014882af1c1cc708119b332d SHA-1: 88b7ff2ad8cdb091c24a1fd828b54b6378b573eb SHA-256: 4001c4b39263236cfdecd3855cf1e9dd7f031a5b8431234cc404eb35f03cfe8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://pistant.ru/uplcv?utm_term=petsafe+eatwell+automatic+feeder+instructions PDF link annotation
    • https://roweryelectra.eu/app/webroot/uploads/file/16198618708821.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/15969362849.pdfIn PDF document text
    • https://tcremich.lu/files/files/45817269292.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784b3cb9955---45515135151.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/70917636057.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/98166033233.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fb8e2d2b4eb862172f48d6dbe04935cf/64081007960.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/31957663869.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/webapamunufitej.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06b1d93d---togivaxupejopolop.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/wuvenobuwavanokusixov.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/85941706696f66501117869ec963cf84/ripolosabisom.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zukubawivaworujelepudizid.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409dc52124---20726464918.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-15/20210615163620269418.pdfIn PDF document text
    • https://datawire.gr/files/files/jolupegetetoritebitiri.pdfIn PDF document text
    • http://naucseto.cz/storage/salavutuguvanepulikulu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e6778a902a7151ea1f17eaa7e472d250/8475287299.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/84177887887.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/efe6bc9b381fa4f868cff111c2ce2b88/napekuti.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c032d2ab25---kepegubupevefobikowasuz.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 17464 bytes
SHA-256: 3927487f6c698b5b380c83ca9ec18f3750f4df908dfef8146c266743923c89ee
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 10824 bytes
SHA-256: e23969d4334964157ee429cd9a9030e2f8683539772b63a51fbc710e3315aa8e

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