Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed5cfd43fb7e1e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 13:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 187b2238deb8190eb1b8b744c1c0734d SHA-1: 696b6d200e75256066c1929e58f9224a33fe8111 SHA-256: 38ed5cfd43fb7e1e0d59caffdbbdd74ba44cdcf510f511939381e333c14045a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true destination or leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1fea5ce4---fagotoxiwuvalike.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents/files/74197070003.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/16627843180.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dfb17697ff84bf15c651fd4c7a4f36af/jaxidodezaxadeliberipa.pdfIn PDF document text
    • http://shahgrp.com/uploads/3252896607.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/95266731127.pdfIn PDF document text
    • http://marymo.ru/uploads/files/28446366872.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/womajuzuwajagozuto.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/98771273627.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/81632498166.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/jotopogosemomevo.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/4618398848.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/34626329990.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/36829757266.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/71063330299.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/juwujiduvusuzomoxapu.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/49927877410.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/80238109075.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/35603428816.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336742b58ad---xuludisobijira.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/92427343296.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032ff3db64.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380047d0883---wovetogapulali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+android+on+pc+windows+7PDF 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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 18120 bytes
SHA-256: abf43bda155e38c630ccd8f0a13da32d571746d4fb1634fd91804dbbfe348cc4
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 10504 bytes
SHA-256: 05108df4daed7dd152d4346826e93a93e8d8817e253ac127b3ee9f8269c4519d