Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bff4f89bad2f31…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 00:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 293f777ec5ab2430b39bf62a5889cac2 SHA-1: 179be25cb682a4b8fd97d3228bf34ba0cf3a05e9 SHA-256: 43bff4f89bad2f3187514a2408a0941ef052bf79234e2ca40701bf0c846297f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=free+football+sites+live PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/rimup.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/58309259317.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fisitesafusojimoxuloj.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/85846291250.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vekal.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/soxabulej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/43639344503.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/modapojafaxexagapezik.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zidoladeni.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3158fe09ec31523f6412fc0b3e44c47/76383913031.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e4535331081b96b44aea6edcb04be1c7/98704868833.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/29d0937090d5b0d92961a8beb3e3ca97/gipasuxe.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/66362828017.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zoramejezusuwerixo.pdfIn PDF document text
    • https://atiksigorta.com/files/kugozumopene.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/xixowavemagenulolumidigu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/98452556025.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/4306990635.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac1a78cb---52883316498.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/28987678198.pdfIn PDF document text
    • http://superazs.ru/images/news/file/29664282663.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/59112550652.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vudomevixejamog.pdfIn PDF document text
    • https://dhesient.com/media/80814788110.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/kidinefuret.pdfIn PDF document text
    • 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_off0000b9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 10288 bytes
SHA-256: 5f5ed0e244cd1c363076cabb1526e036eb23db7d3110bbddf91b584316c6b28a
font_02_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 16620 bytes
SHA-256: 22d1f9c14e2b10433171e33ffbc8bcc72f04e29115da56726b2e76d591c9b0bc

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