Malicious PDF — malware analysis report

Static analysis result for SHA-256 433077210c999cd8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 05:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96295c55d54e50de1daf2bf30c877d8c SHA-1: 73e5f0044cf7aedd7cbe953bffb881072a8f3069 SHA-256: 433077210c999cd8845dabee0a96a8796d8cc7901abb61f271e60a36e0f6632e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, some pointing to compromised CMS uploads, indicating a potential phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.studioline.ie/ckfinder/userfiles/files/14664684558.pdf In PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/polalexano.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8534768bde78de1a01c8380fd998e233/kovoxadufejosujuxadol.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/50705634620.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba48de04ca---pifenusinuragiwabawe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bn9f69bq3b1oor3kv205lkckk0/mivegexuzixejakukefagu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/9176067393.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/lufudawajaxifanojuloki.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zafov.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/nevoduligu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85dfce9cf2---71154036961.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jo61ej7fg0jd4nd0fb4jpt6n0/zuwekowogawoxud.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611638af0ea07---fexivesanivulafexili.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/58692202496.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/xetamenoje.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ponojevikukofolupufon.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/86987202749.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tq0ntuc9ad1kol941n203pbsbv/gitukenidegakawumumibubok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef692c522---69432396412.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/38093862363.pdfIn PDF document text
    • http://mariancozma.com/_user/file/72256384867.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/bizax.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c7e28ef3---nobitetonebuzexana.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zunetesisobok.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/besalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=harley-davidson+2014+dyna+models+service+manual.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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 11424 bytes
SHA-256: c75ec3955493bcb02297bbbf1ff58b391d45d369188ced41027dee57ee77b36e
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 17168 bytes
SHA-256: 122c96bbaeb1605f119c6816430b7fabc302ca20fafddd86c2addb810907cc48