Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d73b541ba4e64c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ab6892e5c4ec093006f352700b21bad SHA-1: f6bbb13d3a31a19aedc83ac1da583e961b676540 SHA-256: 03d73b541ba4e64cf509984090a5aa3ad2a0a082d89fc935932900118e9811c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=how+do+you+erase+cookies+on+your+phone PDF link annotation
    • http://zenithmetals.com/files/wozajoxakaxowebemituvapan.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/75207230404.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/47516483334.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/dilusofevisalilujifi.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/paxuwufiguwanumij.pdfIn PDF document text
    • https://mimpidia.com/contents/files/29038807773.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kjtrel1ermtrk5nebm2bb50t27/28277878061.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tefef.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/16702702170.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pijurid.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/duzituposirulafudoroguv.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/nelutadimewaj.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/37815032674.pdfIn PDF document text
    • http://chromavials.com/d/files/zijutaxisetapiluzuk.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/q1mpncgca5idalvsbbomk9mr02/gatefovutid.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/87295618880.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/78335295132.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/gifegopevukeb.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/87827638464.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tavudoxunowuzogu.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/dutofezadegoxofun.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/64751988608.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/322ac599fd9bf6fa1644386c39cf3d9a/rakiwafonefixefabidav.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10852 bytes
SHA-256: 70959f9d6cef5ad76f29e944aa0908dc09137ca2a687cfae88ea2805c5be1ae7
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 18668 bytes
SHA-256: d8bec486d2669a3d6e2202e225862dbd4b5880d1ba90757aa588a0952fdb5ad2

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