Malicious PDF — malware analysis report

Static analysis result for SHA-256 9712de8a0a263d90…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 22:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d45dc26598d43c3756e7bf8a08eb697 SHA-1: d5a45601b8e623fbee1ab079a9783edfc4d03a3b SHA-256: 9712de8a0a263d90407a3510747db1ae916197ff36d59d7c22a71a22db1ef872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4549754ded---tulabo.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/49272178898.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81cac8f80---zizenek.pdf
    • https://gadd-asso.org/userfiles/file/bubulatifetuzimira.pdf
    • http://kirilmazbardak.com/userfiles/file/juninaxixewizeziveri.pdf
    • http://recrute.fr/files/files/xeteg.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fcc649b7c---pezugivatop.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b314cef1428---31862235614.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44be7ae4---xuwalezikidorimabuporot.pdf
    • https://eseninternational.com/uploads/files/67847019182.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210605094851.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609664ef55d7e---38016700156.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19067e404---ripokemi.pdf
    • http://agataklimowska.pl/userfiles/file/surowovokevoz.pdf
    • http://citescolairedeledit.com/include/file/zojinofesekagujasa.pdf
    • http://aite-materials.com/upfiles/file/bogotutubosin.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60D0147AC412F.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hita04mb03jtuom93u3vuq3k0/47141755197.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/917f3c756d2003a249b25e2f0a7c35d7/46507469030.pdf
    • http://assistance.uz/images/shared/file/34279300270.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ab1c98a8---11391584408.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee66371729---64000486622.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/56654264798.pdf
    • http://3dsami.org/uploadfilefiles/lomumajab.pdf
    • http://ottotech.center/userfiles/file/11997351453.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2b6acdbbc---26305385812.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=welsh+mountain+pony
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010213.bin
8acb56b53398d6a0460cb609485daed3514f003ce1cf0a14126822d24b42729f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 17000 bytes
font_01_sfnt_off00012e7a.bin
f46082796a96defac89a816e0656227b7caf1c43325850df36549d75836bce98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 10624 bytes
font_02_sfnt_off000146a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A1 16792 bytes

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