Malicious PDF — malware analysis report

Static analysis result for SHA-256 203b5d5562a63546…

MALICIOUS

PDF

125.9 KB Created: 2021-07-21 04:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 717197f0d9f82105a2bb22231c914c5e SHA-1: ddc6e49f96aca74336e4e2326cad00d0009215b6 SHA-256: 203b5d5562a6354654e60a3ccf7047526b543a89ffa97cfa97536e2809df357b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0ad99688effa9ea1c37d9b7ef306d996/kupep.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2uctnkkj7rv97kergh1nmhe7n7/75148437890.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/42895814488.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7993411b---79194150422.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/51045225352.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fesifuwotuloxulukox.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d641e2ec---fapado.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/16689663790.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/reborosagegoxafe.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/97156422296.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/84380770451.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/96998145980.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b95be9fe5---96466755217.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/03c81c3e21da9dead4789550f0dcbbb3/11422493932.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b613b1e19cd075f7907d4faecabfef14/boxinim.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160824cade9fb0---vigopipulolovejuli.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/wenifowegal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22b34568f---ninode.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/45962621742.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/jekixololetuve.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca580d8dc8---58798024267.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/65508319989.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80685291517.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796870a1ba0---45634670510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+does+an+esop+buyout+workPDF 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_off00018947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A159 17524 bytes
SHA-256: 96ccd1e40f8dce2e570bc6c9541ffff51b5bf8e71f87e0df0663bffb23c5fba4
font_02_sfnt_off0001cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF77 10768 bytes
SHA-256: fd73e6842dab8103b42b0ebe088fa7478a851a84f7eae232cfca4e5cd61657e7