Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe9c7fa06ca54d3…

MALICIOUS

PDF

80.2 KB Created: 2021-08-13 01:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd99776e04f28af5838676f8dce12a77 SHA-1: 13bf4bb3c7c31d04128eae63e04dda6222c38859 SHA-256: 8fe9c7fa06ca54d3a94fddb0100cf8c541664e24613e85f1ae3631b5e74f4cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bephoangdung.vn/uploads/ckfinder/files/kogotedunawoluxu.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/14125402980.pdfIn PDF document text
    • http://come2menorca.com/images/file/51331204033.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1d4e8639---pelodekojonakigasapobofi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b4674f96f3bc93feebbe9ab38cf5cf81/45600639941.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/jidobuz.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vidaragewasugamawiwa.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/dudejuxirekotonatabulap.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fdca7c4e1bc6abf117c6de98b6218b8f/73217929828.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94331142917.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c18ca082930902b395f404713ee1572/sovewugov.pdfIn PDF document text
    • http://alcantara.cz/data/file/40767121698.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607deb935b85c---18539342744.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de61e0e21---muradak.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kudixidip.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/95980195919.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/52985424243.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i2cmom8mdje8jm414iv6h567k1/teduvefanegotebowo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f18b63c52---3698645736.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/duwipoduxalemesejitaw.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fesebadowap.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bupumijegadatexusisivemum.pdfIn PDF document text
    • http://tulga.ru/editor/files/muwimiwupipi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a021bca9df---40306073476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2018+tamil+dubbed+movies+download+in+tamilrockersPDF 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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 17168 bytes
SHA-256: 26c2ca0fe563a0ff9c25eae9743dba1eb983e3a2491e5a1fc44610bf3e6f8c7b
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 11420 bytes
SHA-256: d1a2a584683a52d36346f37c08ef2f2a09de535290f7df4c53c6da90be14bc3f
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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