Malicious PDF — malware analysis report

Static analysis result for SHA-256 c229b3ee4500d89f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 13:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 404a2cb66f6ff9e59ae9cfa459056b38 SHA-1: 3d6f9e1c96b4ee1b711dcdd7733214c5266420e7 SHA-256: c229b3ee4500d89f1422d69fffac5ce8aab0af1e80bf4a75477128f542353fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=physics+level+3+formula+sheet PDF link annotation
    • http://mfahk.com/upload/files/61528916788.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/52602246798.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xumazofogatap.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rikewetosikaro.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614176e23fa61---moralujobexukogevupokezes.pdfIn PDF document text
    • https://terracell.pt/images/file/ropuzuwovamawubep.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/wezegitefapojokerokajosi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132488e3def6---84344581519.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/ruwodagejorosizek.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/74866571486.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccf0144ea---95131279945.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/xejonato.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/52214260376.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/konudiboragezafeda.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/52572463286.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/87766719882.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/39478628481.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulifuwoza.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/935792198.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/71807164373.pdfIn PDF document text
    • http://szwygs.com/upload/zawojunomunizexuma.pdfIn PDF document text
    • http://mamam.by/upload/File/file/33057447552.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/28021415691.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/tumovijofonawudila.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/tikigaxunoniwojobolano.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c85dd09942---6047207986.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41841e69f---xavojerorotafan.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_off0000bd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3F 10948 bytes
SHA-256: abe9e7ece3a38c9d6ad7af965f23a9fe4f40fddbed8308225d25474fbb3a7503
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 15304 bytes
SHA-256: 36f9c64934d9f36af3f4394778fbe1909a9580ce0856456863a4ea6b0f62ce5c

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