Malicious PDF — malware analysis report

Static analysis result for SHA-256 7661fad8818cbbf2…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 11:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dcb91ce62b2c0a434c027caf9f40bbc6 SHA-1: 03ebee8f978c2b0de8a8c58533dc85d1c0755849 SHA-256: 7661fad8818cbbf29680a14d33c6b8769d0fad183546acbc4b7a6d1ff1052548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to lure users to external, potentially harmful, resources.

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 https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff971196e80---lumok.pdf In PDF document text
    • http://htbestcomputer.com/media/ftp/file/nolosi.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/tonukaxamuwakezodemufod.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/navovozopolemivujufe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a75ebd36---61069749829.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb6ad08a4---46122518822.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/12827149529.pdfIn PDF document text
    • https://paperland.bg/uploads/file/govuti.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/penazi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed590d9035---dediwiketowunuwesokobegi.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/juzijanodesevu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/37547893176.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/8451871556.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/25955224749.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc5bbf676---desilivesazubirumaw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607497569ec98---68057233625.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/23056474650.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a29f8183fa87f01dc9ba5fd708bb2718/31627125228.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/m0po14j807b1h2ivj1pqq27p43/58327132633.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/37484842845.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pi8mo9qe3u4mgh2ah7n8bd4to9/vozidiwaji.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zigafalariwenezikegasosa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jhpckin11l12tpibdiqdimubt7/71989983056.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/nuwegixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=why+the+rich+are+getting+richer+robert+kiyosaki+audiobookPDF 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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 19208 bytes
SHA-256: 95f5403146506880e42acaccd06f59e275d7ae7a5f51818ef6efe23fd9955a6f
font_02_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 11040 bytes
SHA-256: 93974f75b57bfb6dba5e2a699bc8ce75c73a39bc03851f368175f3a75eed800d

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