Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8af29bff45b6488…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 759162f57c8f8aadf174f2e45f3f3ab3 SHA-1: 37e02e381938c7673454249df88af200ceb54233 SHA-256: b8af29bff45b64880a1d267d747521b8bcab8dd018b2fa11b3aa885e87d57236
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely by providing a password. The numerous embedded URLs pointing to compromised CMS uploads further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1b9e1f41f3e9a3d5964a1cda5bfef92e/buberije.pdf In PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/729778697.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/15411618825.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/pisufeluxikixowejagave.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/nukaganipilalurasalezi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/neximivukixuruxelezufe.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/94888774303.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/sirajira.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/kutul.pdfIn PDF document text
    • http://373113.linker.tw/files/17742959385.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/60855683316.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904195740064616i6h7gd2j8xl0.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/pevosefezejagefi.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/51535843463.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/84016124705.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/farapixewatoma.pdfIn PDF document text
    • https://pindimana.in/uploads/file/nadorezipodapelisa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2e0440e21279bf48167285d0d4cc2b76/ninutijutewizuvis.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/tikoguzidanonorifep.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9c54822bc65c0cc98689bac52af30ec6/99213050537.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bdf0489d78e847b4d7852451b43febe8/zufevujam.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/guwobasexubuzirokati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=summative+definition+of+pandemicPDF 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16680 bytes
SHA-256: 68e302d7643c77e6f8db825114bd80235e19c8f212f014f161a05479752546c1
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 10708 bytes
SHA-256: 1b203f14a797c982f688e9d2afc1cd1a917d3b29a9e8f2c27b0239a13cf9120c
font_02_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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