Malicious PDF — malware analysis report

Static analysis result for SHA-256 febc19bf91dafb87…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 22:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55ce108f103d30cc6f30ac5c9fa55121 SHA-1: 0e6aca0eb3ed83d2f24aab0cde4186a3eecf0ac9 SHA-256: febc19bf91dafb87c6cd732976eba43954848ea480cc580ae965eba5aaa1e2e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wenxuezj.com/images/File/bojebodivid.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dfe1bdc407afbdcc6974373fa5e72636/12605928556.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bda149afcd9---kenenelozegirevojopaf.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/povunubijijomew.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/julofesijojewipaka.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ece1c7a9d81---vatowupevubixe.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/de5e5d13f299f53a0677d4a789d626a8/35107533094.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/vuveronop.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/58621715933.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/15660540568.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/vugirapupilijudejidenax.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c556911a791---bateluvonidasuzatowaxavos.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6e531234b4f71514ccdad11c3e88648e/pifibupev.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/70896456502.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/87459684704.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/japovimagipelipar.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606e59fdd8c63---10079232546.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fofifazif.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/30383694852.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e445d74f66.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f967d529ab6---15461954910.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4e325887---28208859196.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/19644215592.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ig1vsuo24j61c6vs8tp4mos5o6/jejokonuw.pdfIn PDF document text
    • http://inistor.com/ufiles/files/48972264464.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17b027240---xotuvotigiwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=arcanaloth+monster+manualPDF 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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10484 bytes
SHA-256: 9104520e9a7dfdf737047cc999049f2be03bc2c378569737d5cec1327b4caf8f
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 17536 bytes
SHA-256: be48cb964791e20ac812359e0e107ab6bceeedd1523fc7b846f37ad0fdf0d8c2
font_02_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1