Malicious PDF — malware analysis report

Static analysis result for SHA-256 33824b5a32003bba…

MALICIOUS

PDF

97.3 KB Created: 2021-07-16 16:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76bb7639275c5d0237872c866786fa47 SHA-1: 2b6dc3b314c0c18e01647d78eece6a09ebaac425 SHA-256: 33824b5a32003bbae8815e9593057a7782a0e46395f249bb5b8c5b51473a08dc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdd54b9b---5653404576.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/37509309983.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/99ae32bc74fe5dee3ac6af8c0d65388f/74012709244.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/k88ap6ikp8rafor40lt4nhqg24/3172337183.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/70058712508.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/91446261120.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/64262847550.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2pg2vniin351q6d0abl3v07kh1/68496869296.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/19906179976.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kugelutisivik.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdfIn PDF document text
    • http://alltechsro.cz/files/29380305770.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61656b616f---wilugaxukokabofisasagarum.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44a1612e9---73927189452.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a298d7e1610---jixemijotenunumulonama.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/66382761285.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6e047254e0ec9d5af82b351a8972e399/nusojokor.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/13321103977.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45261978760.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wubuwemujafekabosifak.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/70369589035.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1532cd4c68---89805758114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=miso+from+scratchPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 18360 bytes
SHA-256: 597199a5adfdda3de551eb0b424a10aa4f8dc93f5b5971f987645dcc7b0052e8
font_01_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off0001514c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514C 3680 bytes
SHA-256: 1ed64549925781e21869bf90ae0dd19f02f72d660c281b16472b512ce87a8f52
font_04_sfnt_off00015fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE5 10312 bytes
SHA-256: 8298bf6857a55db87c5be0f443c846934ae0be7b5bcc803d265bfa3ff7357862

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