Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3170970c204cbc0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 17:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4e382c267f793205394021b7cdf619a SHA-1: 17ae68f7a2fbf549ae0341a412c0ed03840d86b4 SHA-256: c3170970c204cbc06aead09e77b107de9448d7f38a6e57b15251775346a1f744
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The file's structure and URL patterns are consistent with a malicious PDF used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edgecs.net/documents/tazusozomutoxike.pdf In PDF document text
    • http://elskenecologie.nl/files/ruwilupera.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804b2e87c57---vagonofolifa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/76614309159.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092316a43478---dinizake.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43b4d268b---13654335261.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/kofulojugexejijazifodu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f9d6e994c2d40d6a71874b6a7d77280b/lidevuwetenivotuta.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d36a395ae5e---kepavamu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210821_92FE2DE984F1C504.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/65677338003.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///52009247385.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ralegojolizevasazasine.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/7172585213.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/78757542638.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4c5371629b680ca03c1bb6411872106c/rotemepikemulivemater.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6cbbab7611---najaxarunususinonu.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/pivese.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dedd9ffcc1234800a53e5d6204800fb9/39020305105.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k4kvcl5ao2i9ifru3n5is703b7/56064610949.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/88585236851.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789544df254---vijosu.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/zodefatoriwazeboxuze.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhve3g35d67f1s5h7jchi84na3/46081895962.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/pabetefobujavo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ir7if2ui9lq339eva2erf6k785/bewumigumixajisubovupiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ocarina+player+manualPDF 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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 10388 bytes
SHA-256: 24f6d5feb57273c60f7f1b3490ea59bd0de3a1837f5afd325c4e8e269b71df95
font_01_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17240 bytes
SHA-256: ac1d96f50c4a75ca72f8ef647dc7f4cf60cc0411c20b49d8e544004d3ab3a5ca
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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