Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70919ceef6b3d2e…

MALICIOUS

PDF

82.2 KB Created: 2021-08-30 19:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9eef3e915a5a67c0e63a62ce27ec4eb SHA-1: 9306f1f0bb01577c496d457ecd40e89a2a58adaa SHA-256: d70919ceef6b3d2ebfb598ed0067c0f4ccf690761f7f2569fe476f861d9c7234
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3e5725f0---vusawumikava.pdf, are likely part of this distribution scheme.

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6d5ed5bb37717479815cedde02293d0a/46366080289.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1806098f52---71810033197.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/74471491194.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/509d9bf4442e1ba5f75935bc81fd6932/sarewarusawebi.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/gerorigopupijuvolixowodef.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/83704547967.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3e5725f0---vusawumikava.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r5vbuf4vollk1lgeasg06k0mov/50889053921.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/vagakoto.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/rolovenotuwuju.pdfIn PDF document text
    • https://master-service.ro/images/file/konazuja.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899156e7352---rewodebezamakotu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nikilexikumatosasumi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fcd1c9cb1b84d723bb7b009d6f317269/pakubazebabajikugelusixi.pdfIn PDF document text
    • https://cecprint.com/images/file/39789363062.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gesejemijujilaxetuge.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/93080139965.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pplbo4sngaitdkc8pbrt9jifrg/xarekowavaku.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1u29sivkgth4v8sklbij1fbold/70038047335.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tovimefa.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vazesosefuwiramadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hernando+county+property+linesPDF 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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10712 bytes
SHA-256: e8dd3de0f0757d81b94ffc870c6dea616e81b450f5e7d221d07265d0a8d5450b
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 17940 bytes
SHA-256: d1231868b3380a6d78c38d79438b8d9e93603fbef79cdcea778b63b7f815d65b
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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