Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba8a7ed87b4718c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 985ca77fc4a4d7bc26e57b18b93daf83 SHA-1: 19794e7ad96f677f2701f33a443e8bb1f981b9d7 SHA-256: fba8a7ed87b4718cfb03690573d2dcb7cf66a39e591acaae844f83ba55643e59
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0719a4f626d9964a7bcf814096c27bfa/11259254771.pdf In PDF document text
    • https://luminex.pl/upload/file/64820713138.pdfIn PDF document text
    • http://sakra.sk/storage/file/juwirudabazunetolixuga.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/vabupopa.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210920_E47C53E351DD78B7.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/94614419800.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lesiwuwibumekojizavegaxa.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/63032479855.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/razojowij.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/67295516750.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc1a2eb28f9c75ddd81115302b1dd4cb/2468268065.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fizifavo.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/lazusunudikevo.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/97556809303.pdfIn PDF document text
    • http://yoron.net/up/files/44283536565.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/61960091898.pdfIn PDF document text
    • https://pmms-online.com/assets/file/99526673643.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/juzuvasibirumumigolu.pdfIn PDF document text
    • http://zaiger.ru/img/file/dabutuwiw.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/49379290944.pdfIn PDF document text
    • http://villkasz.hu/editor_up/58852731615.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081147347453.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad08137db---36315834911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=king+crab+mod+apkPDF 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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 15548 bytes
SHA-256: fc8517efd6978e33e5a0d8b0358a201c4153e008be4bcd9835dc3943f9eceffc
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10636 bytes
SHA-256: 13b5c288a140c053423e24d5acdd7f8a344c60707279d6146510472ae43c274b
font_02_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1