Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3a4e6694381734…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 21:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19e78d8d750991f14f7064c1718ab9bd SHA-1: 6634111de81594fb873d756fdf12fcd7e0f2dbac SHA-256: df3a4e6694381734c9c5a0012795a6beddd69bcf7d64d361039775137aeadb18
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://safarekhoob.ir/basefile/safarekhoobir/files/84988361877.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614026e6bb215---fonesivita.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/gilurepiva.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/mononibenufixerinis.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xurozilaxeme.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/witad.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/48442313934.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387b94c5a9f---27231433840.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/32444405798.pdfIn PDF document text
    • http://tulga.ru/editor/files/sufimetiwagonosuvu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16135a370540be---78801458712.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4efbbf8a---25128314302.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/1525281369.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/34e2052dfab429f72590d88b44098dd8/lijopijage.pdfIn PDF document text
    • https://apelhijau.com/contents/files/sopogovusizugeladateniz.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varazinadubofomisafe.pdfIn PDF document text
    • https://ms02bet.net/contents/files/tirisus.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/4738636674.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/61377995789.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e3f20d06e---15587181000.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/74424502425.pdfIn PDF document text
    • https://beltamas.by/content/Files/52745256663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=video+for+android+autoPDF 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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 17616 bytes
SHA-256: 7739fd3754355a0eaeb3e350d86dfd0a3ff8d7d91b1f144fc1e0b2ce2758a43f
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10200 bytes
SHA-256: 54c1c32b269d55327559d53b2d7056fba426fd83d722095442f0f58830c72523
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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