Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef1dfc8417ea914…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 12:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ee7f618b18aabecf7d1813c61690d96 SHA-1: 1be3cc7adc5c8684fdc11ba4d28a24f7fc2abf2b SHA-256: 8ef1dfc8417ea914c32364ffe16082c038aecd50f59d7361b938d438e6276d03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to compromised WordPress uploads and numerous other unknown URLs suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://foulardfotografando.it/file/gidusokawezemizilererog.pdf In PDF document text
    • http://sharon-barron.com/userfiles/files/41287083894.pdfIn PDF document text
    • http://friulanapanini.com/images/file/vexevuzes.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/bixakizosakamoledu.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/fixiwebuvedu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448465b9b03---62406776939.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/wizafovojelulogawuwopab.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sikaputumilovus.pdfIn PDF document text
    • https://miminku3.com/contents/files/zitujuzaf.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35066462972.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/26021062326.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f41754ffng5pkuvu774e8ueoos/59888031346.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/kosune.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/9738268539.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/zevala.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/23671093015.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zitade.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://shian-jin.com/UserFiles/files/12445681937.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210904055016.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/47182103531.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0c9aa1fa89fb6b86548cbd3c4cc03c31/24011075474.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/dowokejesisunukegujetarun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=moving+pictures+app+for+androidPDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 14888 bytes
SHA-256: e3a6802a09fd24bee62c32b1c7d404d4d39a0acb90e9132277a2485e437be3dc
font_01_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 10908 bytes
SHA-256: af7b99c1edf78256faa87bfd51664e7e5f19fc5c66924dc90d0d376331febcc9
font_02_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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