Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fc574c9e55f330…

MALICIOUS

PDF

74.0 KB Created: 2021-08-27 05:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b4f2a0d399a5aba3699ef20819fde53 SHA-1: 6e7021598076c1035f9c4e4cd2ce34872492e0c4 SHA-256: f5fc574c9e55f33001ff075763a5da446d529afbd1f614f0191988028d034f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings indicate the PDF itself is structured to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://wastran.ru/uplcv?utm_term=the+art+of+paragliding+by+dennis+pagen+pdf PDF link annotation
    • http://gdfsztal.com/uploadfile/files/ruxogokanujuligog.pdfIn PDF document text
    • http://nincity.de/inline/file/nidulomeduwamedu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/fasogozazopijebisoja.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672c125bb1---kumawemitexokop.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5e9eac2f---dufuzuvuvatod.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75679836ac---72742562866.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/rozopexatojogof.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ca109fcrndbs75e7aikn6gujof/92129110877.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32210719106.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e37c8c0c5eccf4287f17fcce0d90f2b7/10328926560.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23102ae710ba8fbaf989b450021ed696/29725173242.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/79019508359.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f55c0e04e29---39592859348.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ac79e4c2196e52ab0a6e41bb74d9d083/41305591877.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc5e11592---xoturofugomitezapopaf.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/13680324498.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/32790a5bc0c947092d5186b3c4b72de2/zajavivin.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714160750.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zipixinodiw.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c4f11b557d1804e84f53cbb3c7f7ad35/galonavinuxigunubebiwaf.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6c346d22---texamafakuxuriki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c267aab36---57378203065.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/47534465384.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/25107391518.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/pubokoribidaweju.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeac27a5d---45580089558.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_off0000c08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 10992 bytes
SHA-256: 92660b2d196b726a6241af52210a227d718d086814e4c10c949550fd24a04d46
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 15668 bytes
SHA-256: 020ed7925dabc83d6ae4b69cc9e35ebbde8dc2f92c4487ff360c0595bd4137ce

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