Malicious PDF — malware analysis report

Static analysis result for SHA-256 e583c669e5c27a78…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 14:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfdfa6bfb12eaa8d6e453d9e5f8e2f04 SHA-1: aa198c1dfaff17ac0a2a7b3adf1088dde0531544 SHA-256: e583c669e5c27a78ba6d84553045aa9b81950565629334e2763ceb389d1e3daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3ac9b6e724c56565d27beb401f56eb5a/59167970133.pdf In PDF document text
    • https://webrobogo.hu/kepek/begokonefakomu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/85387572317.pdfIn PDF document text
    • http://mariancozma.com/_user/file/81249372827.pdfIn PDF document text
    • https://12shio4.com/contents/files/25864379301.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/57210310168.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/jasavatu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139784d9397c---93931247584.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j1kvvpqo030ojatp020a5vnkg0/kufizadinapavobiwi.pdfIn PDF document text
    • http://livestocktool.com/d/files/68641708699.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/63453149004.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/47626291576.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/44220672363.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/99186481199.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/julubokebedegor.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/pirunukonobobaju.pdfIn PDF document text
    • http://rotang.net/userfiles/file/61553815795.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/polurug.pdfIn PDF document text
    • http://webursitet.org/Files/file/3652670704.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/perawuxadasezet.pdfIn PDF document text
    • https://terracell.pt/images/file/lesezajodi.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210916092219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+auto+for+phone+screens+appPDF 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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16696 bytes
SHA-256: cd040879c41cdadc684000bbdaa39a1816523443f21611e62ec14232ccd36e7d
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10752 bytes
SHA-256: 4eb6b7308a9da1f54d1ce8c6d2180079f7eb4285efdd99bc55c65ad3132950d8