Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa7de14ad845e44…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 06:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b78b6cabf7f937fd08f773ca1e2957a SHA-1: 415f6941e4d5119ad99229c688291efe1d4f0889 SHA-256: bfa7de14ad845e4463600ea1d9842f10b3aa4acb68a7622dde42f9f82bc824d2
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload storage locations and other disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://solarissoft.com/img/userfiles/files/39027047659.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/59973412916.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/rogoxe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2tqsi3p5aeq0rpt0ssmu28fak1/ropososemawigigox.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/webok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33876d349a---dukepepidejigelu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddaa643f29---65740619645.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9215025621.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r9uqotggcv94e9chrhhqrgpn4q/wodijezozo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tadipaboxesemu.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/60516197204.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b548052e---63509509508.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077786bd1d13---52304606020.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/kegetomolamogerojefux.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/li07opc51chd9pdtk0g7frffg0/zavesuluvepufupaguwif.pdfIn PDF document text
    • https://deepex.hu/hirek/files/47402078297.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/11196389611.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/poxiranavowar.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4a7ec19a4497370985db0932327957ef/99358380876.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wetuvafamepowonop.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p4rcb85jb2i57d60a7u565rhf4/zirenegosawifapuravaf.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57951297---mofulebukufaranerapow.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pr7da8qemnne5qs7sneu12ane3/42751743598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+panasonic+econavi+refrigeratorPDF 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_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17156 bytes
SHA-256: d0c600bfb02f3cf6280dcf13722a13e2f149389c74bed8fc9296380ca79a1551
font_01_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 10772 bytes
SHA-256: 86c2650f3f4a38b1676be18c1139bdba715d544f9547baa069e2f21d6de764a8
font_02_sfnt_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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