Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eba1c774792f492…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 09:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59bff7c4fef58aed0673e8b863f163d1 SHA-1: b7dc325a4ea2e67ca3bac63e5baa8107c9b2eadb SHA-256: 8eba1c774792f49257cb18e3cd75162f7aa3cf49792a0fd97e1c47cd6eb55e32
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to external sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://abwcrainhwy.com/uploads/files/girefasixom.pdf In PDF document text
    • https://alperbehang.nl/userfiles/file/29764606882.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/puxexezik.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/lewavabogavi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/bumenuna.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/49066723191.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vupebise.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/45337416245.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/40658629700.pdfIn PDF document text
    • http://newworldss.com/uploads/file/biroben.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/49496114351.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/55873468829.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca972486b0---xiwodudujodagezoxedunawik.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908201158.pdfIn PDF document text
    • https://agros.net/uploads/file/59026469357.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50689c923---pibakebupubulusipawamifa.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/javadonevimanemoposav.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/wizofogezetinikutogawifob.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/63113465476.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/varoguzifof.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sosulubedobopixim.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sunobunuvokaji.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a7422ecc0d078a4dce51bed406850891/64990569710.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/38qdrfcbq8kif4ggv7n7vda9e2/sukagivamutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=relic+run+hack+apkPDF 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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 19016 bytes
SHA-256: fd410d093055feb38ab3fe65dcf3f22d46fe33e060ba7168592918d89fddac18
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10324 bytes
SHA-256: 2b3e806bd69ebf98fb38dbae59a5e19994126b42bcc3cf748b7dd99579021e98

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