Malicious PDF — malware analysis report

Static analysis result for SHA-256 b565c6f394ed8d2e…

MALICIOUS

PDF

91.7 KB Created: 2021-08-12 20:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 838e63a184471f673178573e9d6b15f7 SHA-1: d3bf793756695c986da9f3b278e9b94e8b4203e1 SHA-256: b565c6f394ed8d2e9c4edcc3100697e9db8b81eac7e8af2dafa187e0ea9b8dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://crewmak.ru/uplcv?utm_term=8+ball+pool+old+version+download+pc PDF link annotation
    • http://the100voicesofgospel.de/fichiers/newsletter/file/58787562191.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/petigutoxapix.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/87687977280.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/3836159619.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97841d50d---11832985898.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/91327125969.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/48892970382.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/doragowaz.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5dc18ce999e15538e5bf08c87d2b1b31/89222328323.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/85766140683.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/66a314da694678147024c6c77e5ed3ec/fojoposinav.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f503c6317e6---safut.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841c28784e6---62830913145.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8lg5lgamvjk75nufvrqq00eutv/judizazazige.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160be40efba111---38131488698.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/81520999321.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/mokafowinosemuwidonid.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zesoxozevuvori.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3eukpi3b4m5m7k972ob4lterkl/22899996204.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a12813e3---46206148076.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/gobidaf.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384a277e4e---tokivepevu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e9e9ee566997fff343cb22f695222378/jatiduvukoxefumak.pdfIn PDF document text
    • 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_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 17228 bytes
SHA-256: 2cf62dd1f7077714508a51e35a34a2bea06c0563acb2fb8921fc6f6f8f1e976e
font_01_sfnt_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 10812 bytes
SHA-256: 75c052008f682d1e0a2c4426266cbba4bde259c20c43ca31285704a77649ab95
font_02_sfnt_off0001495d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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