Malicious PDF — malware analysis report

Static analysis result for SHA-256 8531b4764da5c613…

MALICIOUS

PDF

89.2 KB Created: 2021-08-03 22:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77a1dc688f25afb7918eeecdf8a4d7be SHA-1: 14899512126b3c7061f51b8e3c7ded1ee0494f03 SHA-256: 8531b4764da5c613ba0a1f0783edd163cbaeb424826b204217792ac02be45952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous domains, many of which host PDF files, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://medical-1669.com/userfiles/files/54109294942.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/05983d8ca92212a8e29272fc00bcaacc/68667299432.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/bekidovoxek.pdfIn PDF document text
    • http://proxima-design.cz/files/file/71332566048.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/similelaxasikonujalivu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73b84d9c3---lisululesugesap.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/84453897200.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d70e7a003ea0d7d227ad1eb7fa79d0a0/nedowimewu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/sotixowatob.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c68a661bf---xikotinezogez.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/91667354be94de00b91fc1aff1328a34/tebefokojuluwagu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kowulirenikepuf.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/16497146689.pdfIn PDF document text
    • https://elektrona.cz/files/file/60881539208.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kixajaraxurene.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/051900319512.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/42458703368.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c14edbd0---visutosejipikug.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71938de3c---3813242971.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nedexejubuzedasorope.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c5aaf168f---62635231208.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4611db51---26924501110.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/peumnr8s99p57b0memtn7uuku7/nilad.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/70702914107.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/xipiboboxena.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/natozutiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82e964e0f---11552676696.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/subawovologefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=french+in+action+workbook+pdf+free+downloadPDF 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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 18632 bytes
SHA-256: 3d23d05eb9dbe60473bcba16e40be8cd82991979fbae713698a450a44627a743
font_01_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 10844 bytes
SHA-256: 71a2554bc3f37fcc537b74019bfb26a6b6823c7755d7927abf6e0d57eef66ba2

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