Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15945dc06e651e9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 20:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d40d285bd48a2d719d8252d918fc2044 SHA-1: f0e3592d52b42bcf0743480d59af5c48e4a14906 SHA-256: e15945dc06e651e938011127836301c29f6eb6ff8106bea5b1a638ef1f49d758
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 file contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://aksaaydinlatma.com/img/editor/image/file/sewudizu.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ad028fe0514b7b4c17f5818117b5c890/32019207539.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/68254709584.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b30af91c---15325649197.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f71d863581d39bca47918fc211a1a3fe/vutinegogazusivuzib.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zagusewo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/fonuverijirabe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/kraskhjql48c9vcf04tk6aiolf/72006498322.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/xizudubonawigebeb.pdfIn PDF document text
    • https://pellevah.com/upload/files/wenajur.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e6c9c0f79c8d32e72338692d29495d01/jisozoxipirabovol.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kexokajafafemadozidiliko.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/zopurunigonarurewotofij.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/giluxiselosijagiwutaw.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9b172b191b0d6f8188bf4c0e5055f8ee/50987795326.pdfIn PDF document text
    • http://unsersohn.ch/images/file/80859412669.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zibadiz.pdfIn PDF document text
    • https://mimpidia.com/contents//files/fezogakidomiteliz.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/4465544346.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xupaxonotenogotelorika.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210826104732.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb11116779c---jirelevujolokoroduzefitaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=converting+pdf+to+excel+file+freePDF 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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 16836 bytes
SHA-256: 2a5a2f79ef389a849e039d19e7ec5fdd2b1059728ee8cf36deea659ddc02c232
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10664 bytes
SHA-256: 85145b4139ba1c1b657798f356ee449b2af7b5562ee1876c16863aff02368bf3
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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