Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b33d662a052a52…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 18:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 046c511d54117ed29734b25edf59285a SHA-1: c110c620e863413aa8cfa77102b2619d36aeb256 SHA-256: 07b33d662a052a52d1090b3dc022850491dc81735a45c77f398cc66842a983c7
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites, suggesting an attempt to host or distribute malicious content. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c3731d5b57b023249309435997eb51ea/20756175153.pdf In PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/gupuvobopukusijofizonoda.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ecfe38538b3a358415dcd0b3c9ce3eb9/damutepuluwe.pdfIn PDF document text
    • http://mesterek.net/tmp/rofarofarizenokesadopo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49da0e148---finibikog.pdfIn PDF document text
    • http://sakem.org/userfiles/files/79927117248.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c90c2cfa3---16240457961.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7129d7d7a010034a50eb8ea85dcef3d1/28214219212.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6726497fa---bexefodari.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f46f689a879469ee53b2731da9327ed/64132187412.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/84189435573.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825202db674---38118709891.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723021d172c---zegazejanebabuzodolepe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f05f73050f9---lepuputewo.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210717001414.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f66777a50---wosunivezewuxorali.pdfIn PDF document text
    • http://moristas.com/userfiles/files/pedepeberexagen.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b38249a7e613195d5e16346056c520e2/44384358577.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/60909134583.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fb21233ba44---69640344517.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8c8d615c7adf3190aa819f8ec949c795/90354634411.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pogufepilazorovigiziwibas.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210804_57DE7A178F2122B3.pdfIn PDF document text
    • http://yulintimber.cn/d/files/8257584895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=thermaltake+level+10+gt+manualPDF 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 19888 bytes
SHA-256: 8be001036b5ede4ee67dca0b92821b29ed7416251cf51f57afca2596666d1a14
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 10568 bytes
SHA-256: 0ff2e96f086b26df29773f93bec38686f9246400bb496e207398e99819a19154

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