Malicious PDF — malware analysis report

Static analysis result for SHA-256 71840c5b76325e6b…

MALICIOUS

PDF

106.4 KB Created: 2021-09-11 23:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08eebe440d5c9a1d4b836068e234a840 SHA-1: 753b3fc9c7ff2174c603272f977e4550cc73aad9 SHA-256: 71840c5b76325e6b9e3090fa9d44743b59f0781da2a97d89299d3a9e9d22f8be
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic and numerous embedded URLs pointing to potentially compromised websites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document's structure suggests it is designed to redirect users to external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=the+outsiders+chapter+4+pdf PDF link annotation
    • https://beruanglucu.com/contents/files/1352272315.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce4a6e5d2---51703670440.pdfIn PDF document text
    • https://cowik.pl/upload/48686233359.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/semusirawepugokufowezu.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/kerolaxulafebusit.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xesoxoruxadupuxiremeke.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1170ec6---demaludifetejupabefikali.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/kosezopubozivifadogevizab.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/mivojuba.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c78b2197---77683641187.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/zudunosejagotiroworaruz.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/popikibizisuvupuvifukiwon.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a583cca---vokumasuxurale.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/kixonipugezoveni.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/82697197394.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/salatuloporufabobakase.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/14347464659.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/98275188775.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/40311280344.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5cb4a042fdc2883ec0db7702360ddbca/sijukevodulajezular.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/kezuwijituzuw.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_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15389 10708 bytes
SHA-256: a0d6fe09fb9eae16d95b30fc4f572750616aa0bd1071015a2303208ea96d9ce0
font_02_sfnt_off00016c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4F 18660 bytes
SHA-256: 3644bd4b76cf438cad82dd4dab9bc20caeed4184a10498d8d55c6e5b66d86ae9

Open this report in the interactive analyzer, or submit your own file for analysis.