Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19609130f1b4253…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 04:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf3bdbc98fcb14f04a6f842cbe6ef5ee SHA-1: 87b65a64f037343b6b7260a417bd96045b8eedcf SHA-256: d19609130f1b4253f2df7bda0ec3b13f25c5126686978d220f7ccf4eba601f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://easternresources.net/ckfinder/userfiles/files/varugufoja.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131335c47c1c---dugezusafesud.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/kozuvulesodagom.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/95108295894.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kejomepor.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/61608863996.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/tukixajamutunuwukakaxu.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/fojom.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/1746523088.pdfIn PDF document text
    • http://suurelepa.ee/data/file/62369029036.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fevotiz.pdfIn PDF document text
    • http://lobi.md/userfiles/file/67185114683.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/punuxozej.pdfIn PDF document text
    • http://linza-market.ru/upload/files/12445992827.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/17304285460.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///59381108946.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/durijalenetijupem.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-15-19-30-24.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/tixujo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kajirijeborana.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bubenatofajoji.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/03cc068f0a3dce4817ac3614442c40bc/29193014556.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/80196024695.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161399941a4bf0---duxatufabolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=turn+off+voice+accessibility+androidPDF 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_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10852 bytes
SHA-256: b136b63540743dd7eff7973bb148d31686008fb344ee20b8682f042c1bfc23c5
font_02_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 17900 bytes
SHA-256: ad304ce71c881d26aaeda967e690ac0b5267a1a03488e26d944294f1fc857619

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