Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d28f82039848d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 01:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bab6c38d9d1abfcc5c3087f3053c4ef SHA-1: a456808011b048cdf9fdceadaf5581034d1bdfa1 SHA-256: 426d28f82039848d9b3ea213df80cda5c430dabd6231c0c254e1882fee33ed43
212 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scheme, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132872bc8177---xumefotemuvox.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cbb3c05b---puvitudigavaz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff59dcb43---fobawutasinupuwiw.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/1616703352.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/93381331413.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a25cca35836e97a4baa1e21b72eb75a/kiveguguban.pdfIn PDF document text
    • https://ancoraeducacion.com/images/94891595252.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gg2k4r5uadtdf8og1va190vgtm/85382201494.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77667852336.pdfIn PDF document text
    • https://ayurmitra.com/files/file/vepimowuzobilalanesarovew.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/95650344561.pdfIn PDF document text
    • http://tulga.ru/editor/files/23400942701.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/nutetojikowozokiwaju.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/98317281527.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lowukubuwezolita.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/8618032881.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/kalisavupunaxojejopitedid.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xovoregawe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74072591866.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21501991897.pdfIn PDF document text
    • https://somogyplusz.hu/files/92156301635.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/titawaliketexajazorosuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+my+last+call+recordingPDF 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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 10904 bytes
SHA-256: 27b64ee8478a764b10bc360a43d4e24ee9d380dd166eda5cd64229bf3a638a5e
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 17248 bytes
SHA-256: ca77a161639bf2e1d524c409a7fdc52c1a1ecc17bbd2e233b8bc9da1dfcdaed4
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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