Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da934033c522dc9…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 12:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74d7d6d7522875ac22175391921535c8 SHA-1: d7f2b6459c978edb4cb23db531f4a02df1cb1a41 SHA-256: 1da934033c522dc951513c3cda96b1d8ac741b214c139595481dd8f46f2de4a3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into command-line interfaces, a common technique for executing downloaded payloads. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting further supports a malicious phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pivotal-technologies.com/userfiles/file/pufuroxumudovajurisif.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ccadb6cc7a6---28298866736.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87e06eead---tivujik.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/16744860959.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe97acc3fbd---62305115149.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/sesidibosid.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/21a298159677ce14c1a2ba0a5fddc3fc/57202070167.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fb20c1b04---77741695163.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d5bcfb4546ffa6b043dd3c718d4af572/2608839776.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mdo448j0hcp8vpldl8m74ejcmn/bagopurufiz.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/jawolopu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/15122330866.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/75775078079.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/24099797447.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/48sr3k69p8347a2eb5jtedqqhm/18702278676.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd4e7a8e75---27908190459.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fdfe48f00ce74e59e9024c5ff115442e/bajabaxuxiz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02426a236---79857504119.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/mibumisonojalivinixo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a48966d9f---mademogubibu.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/75083518547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cengel+termodinamica+descargar+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9FB 19108 bytes
SHA-256: 4a1ac8201b48c9cb0e33b04736fbd54918947e87f4ec0248aca433339b78ad10
font_00_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 10996 bytes
SHA-256: a378bba9263c392189b32d0fa55d84674146dcff51b2fa44a44c3468f2f0f3bb
font_03_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 19448 bytes
SHA-256: 4868d03be0b618f0022613be2c665466cff6504f1c510837efdba60c62246bd4

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