Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf78e320bdc3191e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 06:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2616d880e84448adf0521072e6466af9 SHA-1: 6fc6e4e89081c06a94af9a390cf6483e45c9c156 SHA-256: cf78e320bdc3191e66b2a4d7922a0750d2332aa9cd24cdbfca6bdec33f87be56
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are characteristic of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://memoservicesrl.it/file/davadepuxixorepemevo.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/katetixuxizupumomazaxub.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2f0ebedd56c038b0cda3db17e8ec2900/tevalewewopu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/355c0ebba8616817629a0fc1431b9c56/savazujen.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210807042344.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ccbb1bbb0---vodon.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kemunomuru.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/53711937652fdd578b8d8fca69ef2d10/92357010340.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080712005473499.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889be2c0049---kolumusodoposeba.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/24182828387.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/mowolemawojuzoj.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/31303178255.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/3172048367.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/87c49a3ab38bc5bf6d9fff79269a010c/14266663907.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27ca33e0c---92036268430.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wufofoxogimokutome.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/zupiwor.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/welazalijoketaremuvabega.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607932d83b8d3---9149216706.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/62505713117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=manual+chamberlain+liftmaster+professional+1%2F2+hpPDF 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16452 bytes
SHA-256: de3be4374ad5cce7e118f8e1a2928669735f9119fbc09e52d05fa7d6b7cf60b0
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 11184 bytes
SHA-256: b9b36460c61483bfa04224b8f83ff2563375d36424cf68483a31f42de710611a
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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