Malicious PDF — malware analysis report

Static analysis result for SHA-256 2338d7d6f9f2a935…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 02:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4eeb36e5a120424ca815a1177a0e5be SHA-1: 6da7b87b667e2fcea06c1f71e1e00e4fa73c9875 SHA-256: 2338d7d6f9f2a93528cad7c9f95b2b08031aca73abf064ae88bc1594117a6f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's part of a phishing campaign, likely using embedded links to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607de237546a9---23621504817.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab9c60e0de0eedfa112ad088ee1e4890/32672922726.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e505d65683---19944057319.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/13521569418.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vevejejirodi.pdfIn PDF document text
    • https://agermag.ro/mm/file/79979045968.pdfIn PDF document text
    • http://webbuilders.com/files/file/kusixojajobizuwex.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945ac1bccd---kegopavapexowederuxeleb.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/37933561436.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/bamejeje.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/zutogimovojosetirenati.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/55477800631.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tixuwusav.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/51615356335.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609739bae0af8---binegegiveg.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77e7d523a---34350241087.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/11619744391.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb97c658dd5aa5b510ff260d1fbad657/vugodixirukofajoparijere.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rjoulrs28gmgiqqq4s1c9k8g0v/zidobulavedofefibax.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k9646uim3efqdpkr5v29ior53b/65128458700.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/75482513468.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/997n4d6cqn6h307s0uatepn3hf/98877555957.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/35771425391.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/59954942147.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/matisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=send+pdf+file+to+printerPDF 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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 10236 bytes
SHA-256: 09b73fcd3e1ead40cd2f7699519868fd4750e2278d6038fb3884a8bd3fce9c70
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 18508 bytes
SHA-256: 5b1dc3d1e9311308da41992385f3405b2a8a74c81afe6f6545dffae4a0fdfeed
font_02_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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