Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4785a68fd69a340…

MALICIOUS

PDF

65.1 KB Created: 2021-09-07 19:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e81c359474a28f9d75767ac83313b5da SHA-1: 67ffc94012f4b72aaa7ae35c52c70da54a421da1 SHA-256: e4785a68fd69a3404bbe614ae05c419d028fe7c7a285503b9f61a64f04665155
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links to compromised WordPress uploads suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 5

  • 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
  • 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://ingmontagna.com/userfiles/files/rifubigududasubabadivur.pdf In PDF document text
    • https://bem-sa.com/img/file/sijapug.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/43925782166.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/2436816946136904b25f77.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/86779013382.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/20542920391.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/romarezudelawurugoga.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/jopagolutidagovexor.pdfIn PDF document text
    • http://getem.eu/files/file/loguweditoburobifavokakub.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379573e34c---lonenabubapoxiremolarowo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fg4mfm2embgtsh3r2jbhmicbu3/42678560957.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395290fe5e---10943041134.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bamaxudoparokalavapu.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/53363449239.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/85680321437.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1e78c142be6c344258f8c36fe41e3a27/welarikigotifusosizokuta.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kerutabagukozusiwufegeje.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ouh3j8q91l38j2jr9n0t2f3pqh/jekofoliwafewej.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nemaxan.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/64470942162.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dafulenojudo.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/71150631211.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f1631a3a5bf---xewolosujab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ausentismo+escolar+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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