Malicious PDF — malware analysis report

Static analysis result for SHA-256 250879cb53662962…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 22:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03be8962fd3a685ec522ddf3cbf90ece SHA-1: 62e878e69b192a88ca3ab77b15fbc23aa20c484b SHA-256: 250879cb536629628f4e084697841c329e4d7951838d9100e0f34c0cb5219a33
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 WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608add24325a6---16091955956.pdf In PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/fogomozil.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210614100121_957801934.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/22026056253.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c1e4705ce399f075940c0cebcb509b4f/vusefipimupefuzemebenok.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4a737d46---56175770702.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754bce1b590---82355798628.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344da8b9f3---pesokoxawun.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608410c2f2f81---lasefiwisavozu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a214a507---tuteziruwikasegimoke.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d268d175430b56ce48a3607b45296199/33743727241.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/66854021952.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827c88868c---33809302099.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/1b6f4b3abbf3fded8763b9ce7fbe100c/80202249350.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/75245134198.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cndb9fkosqraermfsas6q9mse6/jozuwojarebonekezigaz.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gurilevexoriweboxi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f812e96090e0fe9b6844874978d330d8/75469239408.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6001a6c057---40574940572.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9a708dbc9919a9426d8dd09e20ec497e/61658556544.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd7e47667---bivegafuretinuzepuwuf.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162521560164.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wasufevowezowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+a+good+discussion+for+a+research+paperPDF 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_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 17000 bytes
SHA-256: 323d9b78b23a9b486b279c4b7f0f81ed3585ad794ef72af1998b0266a7ed1014
font_01_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 11028 bytes
SHA-256: 9b7c9b039d9196dea0b6da522c61f4ee61b5b3c6117dfba075141bd2710071b8

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