Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5343b789967e85b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc5ea0ad220ba3ec6598b3d50a59b346 SHA-1: fe17c52ecef029bcbff4573d3de1d5369e4e61e6 SHA-256: c5343b789967e85bd39281a2bb42dc0344bddbd364d21f1eee4b8f0d64f31bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other potentially malicious URLs. The PDF structure and embedded links suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bancodevida.com/bancodevida/admin/images/image/file/42429587032.pdf In PDF document text
    • http://esebtekstil.com/resimler/files/lonekizupibidosulo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kesaviburazo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8783065a---wijejuvilerenelijixir.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c161fe5---matefupuso.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eivgtc5buuf52greschponkvfl/65787080647.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c31106211563f6314352f4f4f40965c9/gekimesofuxufupasitinato.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/70312510698.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63f4e846---befutupu.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51331189293.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b1ab3e57344bb1b8ae35705d5f226e0a/tekuxelo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/19607750503.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c68660a9---xikikomubuvototasez.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be9a2ac9854---55038946058.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b509658b9edbb5001e356c77dfbed39/bemuluxamaf.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/91357575655.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743f5661fd6---tozegusajeruwidutuja.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/80727808571.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdfe488a9---kejupuxezovobezaguvis.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jalawuvide.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/90485973524.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078620634cbb---4926233077.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/gojotukaket.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/bukutuzixunuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=daily+answer+writing+practice+for+upscPDF 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_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16796 bytes
SHA-256: 13ca4942a8456b4f89e702ca897444fb2534824958c49d61d32f765c78db7785
font_01_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 10956 bytes
SHA-256: 3ab812836e24cad8cb70b58a0b1b1dd07d9c18238635bdec586b833026b350d8
font_02_sfnt_off00013962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1