Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b77bad046043c6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 22:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f1af1079b5e7d08a16b88b4b4f23d43 SHA-1: 2c9caae9e5ec5b548d260cc97794ad36f70dd1da SHA-256: b1b77bad046043c661c26dfab4af92b044e6edf4c85b08218bf05a5234bed4f5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sinners-party.de/media/file/sisonazuvadotapewosaxu.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612633751d3be---nupubafinexezudaru.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/653c78ade2d1fd351f366f925224d266/41325693022.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0dqet3fnts1d3ogl40ncbmgakg/26912298463.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/61c3e750e504310bd121c665b56230c9/gitinokeposos.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3f66704cc9699fe6a05b0f15ec4f3cbd/47186468866.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8906fade97ae4a3b5bde02e50320bf27/jexugowolifijinixod.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddc30c0fd---69202313494.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/garinosajimevovaxejijoson.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/464cc8f44cba0a039a0ac2a6c8840c99/rajojap.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0uq4sfuepp7pnorggi8518qfno/giwuzorijeforufadaweba.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba68ec4cdc9bdbe9161f56ef35feef67/rosira.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/kanavasizigipeb.pdfIn PDF document text
    • https://coevent.ru/upload/files/nesuk.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd1312b24---wipamakonimovozupebopezog.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/19830983778.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/givarujosifivalaxava.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/vozetokagekikifazelukewuj.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a25f06ebc654fde17989763fede8d802/welawuwokizolotalam.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607898d57ffe1---12129440414.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zuwenoluzaralalor.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/19509010831.pdfIn PDF document text
    • https://lesura.net/userfiles/file/watujewur.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/bafewopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=finnpipette+f1+service+manualPDF 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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10716 bytes
SHA-256: d2a47f087835bc6b74b6007306102062c3f2580e989033521ce4b1d6e71447e6
font_02_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 18440 bytes
SHA-256: f1da150fb57e88a9cb44cf6b58ad94dd69bf7ab4b589b0dc28edf79e68493587

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