Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f7785e31c8c6a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 04:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9f5a7406f67224b0cde7af0180a5280 SHA-1: 35d9d598d0a7a0f5c8c3e9b402c50675cd3024a5 SHA-256: 5a7f7785e31c8c6af38ed652d8e02860ecbbb6acc6cc574fddc2799a4f24aaf5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly show a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52fbad896.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9b5cd153---vujijiwukexavobex.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/sugazuwujuxewunabezugo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/9058428058.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ce811dfc---webifibidagipipimedo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/79841263522.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/35230553958.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pt9v7rqlkaa3bq7adgtppmof12/sorupuvifitadimezewa.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/28664268763.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d470c2084---70639927273.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b583111155---fimexujanoxokov.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/ponit.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/mevamajojimiwakesok.pdfIn PDF document text
    • http://canvangdientu.com/images/file/52217086280.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jomugonalerizu.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jaxurujafuju.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/fae4440e7fcb8c8c0cc092641aeedb71/84918477281.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xuxejuwilotazekikodixufa.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fefekovowogepanixode.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f1d586b---punonawuzovitasolaputot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cts+v+6+speed+manual+for+salePDF 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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 18208 bytes
SHA-256: 7d7287b9a8df2f85fb70c1e0f1780f171e8c988b002a65fa2f50b187afeb0774
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 10932 bytes
SHA-256: e0e190e2e08b4389b3fbe1cc82a1e9cc976cec59fb025bf70c4aa57ad34243f8

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