Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e58cc7ac65b1e7…

MALICIOUS

PDF

71.4 KB Created: 2021-10-05 14:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 606bda6fda62a3e61da1a531fa7d1a4b SHA-1: cd2ef9fbd0096e3bf292f4be639f97a5548119ec SHA-256: e5e58cc7ac65b1e72a0cc7a20d55e17b4b5c631dceec6c61e60bbf78e16082c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress uploads and disposable hosting, likely to host further malicious content. The document's structure and embedded URLs suggest a callback phishing or tech-support scam, aiming to trick users into calling a fraudulent phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+tell+if+a+function+converges+or+diverges PDF link annotation
    • http://dichvutot99.com/webroot/img/files/tirodokojeza.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf22fea853---xamewiwebabexowabi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/toxebupi.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/31082032302.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/10539900341.pdfIn PDF document text
    • http://splogservice.ru/content/file/xunumepidupixane.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/wazawuzu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388e918fe94---72465527246.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/bodukis.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/fugeta.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109191317198573.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/dufujore.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/98464192093.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/zolinevatumuwanil.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/bewonewovomuxajofasu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9n3t5e2pq4p86kgkpf9gs8gdes/tebowodurujub.pdfIn PDF document text
    • https://citronel.com/userfiles/files/guxirewalu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8acdba87d21c9d2bfd3f3c86834da011/4031876518.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/47674518497.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/vamubewago.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/magebabenurutibifijuvubi.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/jobekirukozawirad.pdfIn PDF document text
    • https://mahae.hu/files/files/detafalazuwukega.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/5668420085.pdfIn PDF document text
    • http://deauville.ru/files/file/64405664522.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/pevutipanepipik.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ac48143e---fulapatixo.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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16272 bytes
SHA-256: 8d101d7cd739014e97f9c1d3c9787e99f5de679bdc9e9129d287f10f97afb851
font_02_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10892 bytes
SHA-256: 80ed4b899e9dd79946f64931fa799e97f72302def23417419c5b5536609821ea

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