Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c90bcbe3dc7f237…

MALICIOUS

PDF

78.4 KB Created: 2021-10-03 22:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d88b24b5d9263710765582eef705a09 SHA-1: 9d476f532fe3f9ceeca61e2ddf1595570cbf8637 SHA-256: 3c90bcbe3dc7f2375188be6e30258daccfb6f020e4e8d49765433451d9a6edbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially malicious content or exploit kits. The PDF structure itself does not contain executable code, but its purpose is to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i9g1sug1hvtv39kkj3tum09rs5/20257261352.pdf In PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/78295787247.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/69480918281.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/wuvawoguzapade.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/37313917614.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/rituxi.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gojipirizedovolaz.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/sunikaposajagulezupevifi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/23204737252.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/lanonupeparixozu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/25547036342.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cda46464---pumukowanozorumipi.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/bevuvagumimegufebogubez.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3afca140---94211745388.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/40996621100.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/somafukevapewamowotag.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/74017816381.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/verusevifakakox.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sazixovonomudawabem.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/5489191179.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b31ee69fd---rinedosakolubijemosu.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/valojobema.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/xilidowemitexaresuzi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/rotonawebarewa.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/49236538944.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde994e71d---nuzenuweto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fast+food+carry+out+near+mePDF 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_off0000c3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A4 20640 bytes
SHA-256: 9e2248dfc930052f3188dbe49fe0a2eed02ee89d315a875dd7eb2561b684ea52
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10692 bytes
SHA-256: dea549384adc4c3108ab02443aa17dc79715084f810128f5d76285e010a8e005
font_02_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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