Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58f7f56b904e66b…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 02:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efe1a3025d955f9db9d011bd00a48e32 SHA-1: e7f6440a1f17b8cb82287371e7c246222b0d9e83 SHA-256: b58f7f56b904e66ba0a4fa6d72c106ee744c59b8b5ed3f59d03ed0f5fb199a9b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an intent to lure users to potentially malicious content. The presence of multiple external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/kejarolikotef.pdf In PDF document text
    • http://firstcuwire.com/file_media/file_image/file/74408224178.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f304d1f2470d1fdd6df9c50e85c74950/fovetalemut.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160760a60ae66b---71350759449.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/16122583892.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/dipipuritaxu.pdfIn PDF document text
    • http://etre-belle.su/images/file/52065280676.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dae37fa5a9bf86d3236d28343a70b5f1/9391337472.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/wigigabivelevoxakikesis.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/lukezumimufarenala.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/guxumupenimezulu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafce18e97---kibezozumeti.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/momob.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zoxumazuzajejufimurisa.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pifovategipimireju.pdfIn PDF document text
    • http://contelex.it/userfiles/files/wulojopa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cc9f1735eaebfde89ec28534fce47486/moninirofaxujewaxosape.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/78229776001.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b482fd6c49d---29376399861.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/vavowomuvogovezasikud.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/35200355105.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210627_051346_9904.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/pijazuzevozofodiwu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e7kmu3o258tn0blbu4lb94o7dn/pebox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=oral+solid+dosage+form+pdfPDF 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_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 17920 bytes
SHA-256: 3afb5b4b36b0ca626cf13469e112f3cf28011befb8857997f05461bb82bd974b
font_01_sfnt_off000133db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 10664 bytes
SHA-256: 7a9d04e076410dfdf0e538a5699ef8f94332e4fae8401b1bf78331918e7013b3
font_02_sfnt_off00014c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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