Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275293b51c5a2c5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 05:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcf6bd0b0004550d812f550cf8930383 SHA-1: 736b0a7ee2c221686cc660b025a7df5b3c76e133 SHA-256: f275293b51c5a2c55112a9c11b6b7a39edbe9ad49bc93f97614741a840307ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=ctec+conventional+fire+panel+manual PDF link annotation
    • https://alnahamgroup.com/userfiles/file/64934293327.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1jpg819bjgd4n9jkm03289oeat/fodixujazugexozazo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233e2cf48---98775480808.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dexikofezoru.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc5b02189---71720116601.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c14d0787---45119215813.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8163132998.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/47363032916.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fubojiz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9b83f85c83cba15840c3e27b5cf0fa6a/kiduxemafoloresufuvetore.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/69939893436.pdfIn PDF document text
    • https://12shio2.com/contents//files/xofadov.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426f82083e---femesolerikenapowefeda.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tapafatajijesozuxez.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/87547626346.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609453b05d2b4---15866125983.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/vupumanunipinapid.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/37421411198.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917ca067a52---pepigedozivamaxusakofap.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/31459339546.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/xebipupu.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/rizaninudov.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b7de9c3b2f76b4c4f8ccfba8d728675/40832498171.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/mufupegezufisawolo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/103905182.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9684db7a9383b8ce9d7f2806075621ec/kamepij.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/15485020031.pdfIn PDF document text
    • 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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 10668 bytes
SHA-256: 6a4375396b135d25ebb39efae22770536508a75d52d8f29ba020969d53d81818
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 16828 bytes
SHA-256: 9de71c13157beacb1d8d28ef2b3239fcd10b0b70c6b2bd7e00b6eeedf981c954
font_02_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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