Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd5d1b3775b5bf6…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 02:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c04fb6e62444e4b973d0d1a154c49807 SHA-1: 91aab765be017aff39fcf5bda5edaf23be423eef SHA-256: fcd5d1b3775b5bf6500cc10108d1e6f5d9d041867cac941977bc70b920782122
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://caribemed.com/userfiles/file/46387556657.pdf In PDF document text
    • https://windsbs.biz/files/file/3202531500.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e5741e4f---kosisuvenakedolakabazax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9cc1a23fb---24985638351.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/077a1588cca722f1c59b21651d77d974/xarejerapixuxuwebaju.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/26859924180.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/dakofowipag.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081835625878---53765225237.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/musisun.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b5143cbf---vadibikegerugegu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/kajazonozabetani.pdfIn PDF document text
    • http://sb-78.ru/files/file/62899729598.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/grh9nqe05r0ubgmk8sh3sptb5o/25187163324.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hnjmo8hlfqs0u6hccjd56ojilo/movuli.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/genirimiwaxedotebawagavu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db12e1e46---26332088478.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/kajopejawukipavos.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a51cff486f57b686e895807a0deb6c95/69021131189.pdfIn PDF document text
    • http://fields-on-earth.com/duzatifagumiwudisetekijum.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/52932949228.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/pekuzemiriwibejemogoka.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/50b50a67e9ec090e9290588bbf75592c/fopitukuwu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7881127b8618908305f11dd8f502e048/mixakugotaxumafegiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+assonance+and+consonancePDF 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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16736 bytes
SHA-256: dd48d61a969f4955ba56d12db78573577e41b95ae112ba116336c4e351f33347
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 10652 bytes
SHA-256: 89cbafd211c7010eaeb9f8fffff90371f750c2463dc1dab78b66fe16bd2a2fd0

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