Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3052ec616355d7b…

MALICIOUS

PDF

123.4 KB Created: 2021-09-05 10:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c0d97abd0666318cd0b769a523922ab SHA-1: c0b72a43fc348f2fee1af4f0ec4e1dc3360570ce SHA-256: c3052ec616355d7b49a72515ecb4b27ab542272fb93aad5e60079908d83931bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure indicate a phishing or redirection attempt, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/s970s7tb1l3ds911d8s0jrod22/nesovotu.pdf In PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/zemasot.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/18cf79df563404ae0695d2a52f7d607b/tolumexewavarobafexowid.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/36148096430.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/be5974076a901c023ad59aa6a9e20a3a/69828376472.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445152e648---23345883630.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/votiroguxiwupipidetewi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n5ohoaup3p81a6ig72v6qhhps1/24914680919.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/46737179737.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611792d842c7f---33187632709.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/mutujejomotixitabena.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c6f81f2f8---41749788350.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sosenugizeveluzozilebiw.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/17764553054.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/tekiwabuneg.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/40497460933.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/74909170180.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/vozekovijatalajut.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4164e3ad---57218106096.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/lawibitijezubuk.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/abfd322eb0fa76cf5ac7a150f7fb6259/mevaxuwikakig.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef193cb65f420c7d2d56e7d9eea553b4/wejuwel.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/23841443528.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fcca6ac0d3b93785e3e6fb0bf74873b7/7740546793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=grammar+and+usage+for+better+writing+answer+key+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_off00017c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C38 11364 bytes
SHA-256: 75caa967306d52288eb19979bee8fbc3736eff96c2a57cf84a7df906ddc2ef69
font_01_sfnt_off000196aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196AA 18656 bytes
SHA-256: f07698102aa08b51d184eaa58d92ed6a3767a1f6ae87201d394c0b79a6fa3218
font_02_sfnt_off0001c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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