Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ab1d15f44143a…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 14:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd84549421704b715b2899f42be8aa5a SHA-1: 2c238a13197f35aff04a3c8ce59554d08696dda1 SHA-256: a47ab1d15f44143add768f5dc5e9a897c5db264454e3ace18b8f2b1231725ec9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary goal appears to be directing users to malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq7tjn658b5djch1h8a9v1949c/forijawerimowovepigi.pdf In PDF document text
    • http://haphadoor.com/upload/files/37009215274.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/nl2p7ic7meda5m4i2c7ubo4q5o/boxegod.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/70475499382.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ac6c2c8201fcfd362c65ea0881a52594/kozilebalo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/16367608495.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454658900---lexavolaseboso.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/75200047338.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b2fc3729---bikukevixad.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/52574771642.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/21082138879.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/berelugosisega.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lukuvev.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210618014103.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/tolozubemitusonuxojoda.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lakawu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/danunozara.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bdd049b0f53c6b4465977b3e5d3300e/14110134801.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/88820724557.pdfIn PDF document text
    • https://highrise.pl/file/38946446742.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1d59f3c6---bimufativukerotun.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607066b100a31---84791542123.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/57763731734.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cc7aff9fa6d5c6beefae61cfc98d3a36/gigewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mi+lucha+hitler+pdf+completoPDF 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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 20236 bytes
SHA-256: 7561b30883f84642aabfc921c39d1b2ad3f6dffb672bd0d58b1cc35ee5bd3109
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 10704 bytes
SHA-256: c3144fbb0e0b17ba86386657fd7fae3943fedd69763469aa1b8e7a58225b3c92