Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6dc78bd03ead7f…

MALICIOUS

PDF

94.7 KB Created: 2021-08-03 04:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 785dff4a16a596d5f1f1d7dd227108fd SHA-1: 04d4aed3004923c94eeeaef949be0efb8b8d1628 SHA-256: 2f6dc78bd03ead7fcc6fcf83acda5e96f60ae48adc74d5225bb7b7b383e8ea99
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting numerous PDF files on disposable or compromised domains, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://alatheir.com/atheirwsfiles/file/kivomekezupapajimom.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5p1e5ngtjqhsbgqd2dv1v63kj6/wilat.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe30939f655---sejidobozekezowexul.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/08e96be15c694fa7814315f8d7a5bea5/buteripomifapezadilu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/vivifagefeg.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3b1pvmb0ec1e9vjigg2tkl88rt/88740788731.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/80224263427.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/87784904061.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/9276309c15e1969775acb614cb73412e/97224213013.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134b3bf30e---73340866315.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624387876.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ceeb649e---81041967252.pdfIn PDF document text
    • http://recrute.fr/files/files/63236043589.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc98ddf0b4969e67898c2db1554e5775/74141096161.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/gikananawogurur.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ebf8ae30---nikupivibinuruli.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210730025533_1226618174.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/degolodupobanesikejafibar.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7e08d268---nenubekozodemefijituwipik.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///97637618444.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006bdaae312---wasoterefu.pdfIn PDF document text
    • http://markone-tools.com/upload/files/20414652007.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c469fac9d19---58122122923.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210725_9EA2DFE644FA8B94.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66967958474.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/20348790728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+much+does+six+sigma+black+belt+certification+costPDF 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_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 11432 bytes
SHA-256: 0094fd55bbcc5b96a1827df5edc1561770c92d6887dc575e6e767b3c1a447b36
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 17376 bytes
SHA-256: 649ae78a74800e2fbc46978cc1b7189be921acb5b664ca3460fc076a538858a3

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