Malicious PDF — malware analysis report

Static analysis result for SHA-256 b003e5b5ebe73042…

MALICIOUS

PDF

86.3 KB Created: 2021-07-21 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd2e613202d78fc80c024448a9d1e562 SHA-1: c526e61dfa7a131cf094e0ab4ccc778f0c613a58 SHA-256: b003e5b5ebe73042579060f465efb50a34c4bcc8b5fc396a0337a86c6a7b3102
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to the PDF_SEO_DISPOSABLE_LINK_FARM heuristic which identified a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jfj04si60buhduuurh78nuh6q3/58433508057.pdf In PDF document text
    • http://palami.by/images/file/wobowoluzumefugim.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d366649d8755135c29d7fea17e98475c/pisepalulikikopijujedumak.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/didijejome.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/24486722072.pdfIn PDF document text
    • https://senhewood.com/d/files/52209640565.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1423ee6a5636bd5d4e7c5bf5750c86ca/faxifezuz.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9ba1e4b51ef5dae48cea30e6a753b684/34994943684.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4uj9d6jj0lb29bc928t76r9vf6/19298142333.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbe561b02---42744219190.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/dazisapinawafadibawovot.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbba02bd0---larugedet.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2omi8vvpe06a9l94g1g8ns40b7/84820339453.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074566c4af99---35016462196.pdfIn PDF document text
    • http://didopack.com/files/83544413637.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e25ddfdf7---zakodanebapijikonedifos.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/97c4bf0a594cec581a6ba9798e09857d/31324465317.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaace4fc58---28292268627.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fddpd4nm0ac5ko3adbjle0sqc6/jefoje.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/dajaga.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/lufofimebixulaju.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/47467416136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pic+collage+for+macPDF 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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 18524 bytes
SHA-256: e6acf98ad11841b67beae6c005a702faaa40bb7f9994b8c907f7ae4944b6a94f
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CA 10308 bytes
SHA-256: 0b07d58729e13a0376f75a0c4c2832cd32842152c858dd45dc03373f1232003c

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