Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4e38e4214885fd…

MALICIOUS

PDF

91.7 KB Created: 2021-06-27 22:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cfe872f1b05561effced3c6a213d740d SHA-1: 5a0dd4a9a25b24f6402b5f693fdef3eb3fce91a8 SHA-256: df4e38e4214885fdf1aa3f50c46379a60b39a1d110b54a5bc1be26ab42023db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47dd6a224---putejitajipijonovivibojux.pdf In PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/melakufarejogejuzokedegil.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/25784803780.pdfIn PDF document text
    • https://efnnma.org/files/file/sanuganaburipomu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a730ba80---tifufawimaxox.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071a614b623b---minuxukomivagol.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/07d73ce750bb68a94d1aa1eee9bf1d73/petujalejawabejosa.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615357bc31---82842377021.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vbaq1s2bs3lucstklttcu8dv60/xivelipuvipufipoge.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609045a20a297---23724672924.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d043e217f---75745941939.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/66929228172.pdfIn PDF document text
    • http://tcihk.com/userfiles/69457162990.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/mexomefowabebisefuzix.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608015bf5f70b---sudijoke.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9049f13895---zufikolavet.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/toluturakedimas.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aafec6867ad---62273451446.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/sogagefemowitajaxi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lgb1kagg7pb3iut100q7qp5ogq/saxob.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0f2bd76f04935602d2d9bb543fa3e310/zizop.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c450bc89013b9eaad5164ccfea933a4c/ledeva.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wijogexewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=letter+to+the+editor+sample+for+students+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_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 10820 bytes
SHA-256: 309e8d37f7801386a261f821fa97e83a14c5239adb6763abea2fa786a78f0a9e
font_01_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 16444 bytes
SHA-256: fde7e9e77b21ada1abd69b7cade5e68251853e6e4a566e87e3d2140b22474e21
font_02_sfnt_off0001496e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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