Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae86e6e17325f8…

MALICIOUS

PDF

113.4 KB Created: 2021-08-18 18:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 760ad86b19cede4546f6efc256f3c6c6 SHA-1: a43582065067175798ed7f80ca740985dc755e2c SHA-256: c0ae86e6e17325f82cd9d855cac58d8cdfe9ca69f3478136a9f5683b6164dbbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=baixar+jogos+de+emulador+ppsspp+android PDF link annotation
    • https://gulceoyunlar.com/calisma2/files/uploads/65094921860.pdfIn PDF document text
    • http://dalaichau.com/files/wagikoligopudev.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6187473ed---22576133306.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/50703135975.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/nonojefuwedaku.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ba1a515e---41558326305.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/674b8c520e02fedcff6881360fdca840/59846606394.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dasefidojolakisibale.pdfIn PDF document text
    • http://novafish.it/userfiles/files/9942534058.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/33231c9b2a83ed2ecd703a4b3a0e373c/52334251631.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e29b35bd9---81100521147.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c408108031323fe3d7eb6d9196bc6ab9/mexavekuzuxedadudiwe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb8238646---jazikemiguzositi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e305cfbd12466f5b88766ac163e28a71/dalagijij.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/kejefukabakobokugagepefi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/20423128826.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/77299647671.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pn6p2stnf61nvua1ju54k8c2r0/31520349252.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6c3e503c---koxux.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9ef91324---fekixapilekifaraxawow.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cf8534d2f4e747f0fe4314028e894f3a/zivepirolawaboxogab.pdfIn PDF document text
    • 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_off0001533c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533C 11024 bytes
SHA-256: b2ba7ca5566b13ae264878ef30119c6a8e284ff7c8bacb4612c87239be90e3ed
font_01_sfnt_off00016c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9B 19688 bytes
SHA-256: 26f8b7125da3c62f4e377cf032f1326888393d2b4a38d6815e7f21a7a4cc2b80
font_02_sfnt_off00019d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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