Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddb3f2f2e9bcd86…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 23:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 983e9e3043ad7a8f129e775a2b8b49ab SHA-1: 76ef079c8068b70974e6cde1ebb5b70bcf217f43 SHA-256: bddb3f2f2e9bcd86ee1f4f0d396eb3d1fc2c1655f84fdf3ec231ab5127e72571
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, some of which are hosted on compromised WordPress uploads or disposable domains, suggesting a link farm designed to redirect users. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://irlanc.ru/uplcv?utm_term=how+to+cast+mobile+screen+on+pc+using+usb PDF link annotation
    • http://medicapoland.pl/uploaded/file/35904085728.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/2836753836.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/67620641588.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/26810812067.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cd3652f00a7a2716ece6ca3861c91826/jofeb.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/94309193430.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/12384638138.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/furiregonadumepuka.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/87665156804.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ec0e69a8---61391583168.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/phmn8s94150mug127u2et2ilcl/vifanuvizomes.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/aad6a3b4aee294d66f13543e0e1f71ae/fudavifirulobireti.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210905123519.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80965430c---70331534747.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/voxituvuxenelete.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/bozapiwivinapinirujobafiz.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/75527764350.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/wesowejuzukut.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nupibesevugogowuvupujo.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/63987671295.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_off0000b94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 16148 bytes
SHA-256: a21eb8ad477fb9db6526b6207deeea7bc1599c4ab0fe0104ae648f238c3f8cff
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11032 bytes
SHA-256: 83b51bc74d8de3296e3d0a3f8450ca595df79863b3eac9f085b7cb00b50132ab

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