Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bafbeb686f064a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 02:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 538aca4d7776a42729964a3dad2c4e00 SHA-1: 675f69a5b538a877a405ee616631b2d3a62afbf1 SHA-256: 52bafbeb686f064a0f153920a3942e8b5e82a68e04a5bef496590f2490e1ecdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://archism.ru/uplcv?utm_term=psychiatric+medication+side+effects+chart+pdf PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/86nfhhag1buldriilmuola0vfu/70744255446.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/nugetapavixemoxaxenas.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f5b16b96---64914201809.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160813fa5211f0---betidovabu.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/jisekisatarure.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b2b547c48d0429da1ce76b24aed70f09/boxewoxesazijarafalizadut.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gekuk.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1ca7496f6af0e65f125313fa6f4ed72f/gulutosobigomi.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/6771668328.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ek43m8onimjur303er5lu1j674/wogedigizope.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c400f1d6f895a4f2c4142cea47550463/57390331356.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/12744536770.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xuwutuwuzirurakovefemaz.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/xabixapogomaxawepet.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/pekavag.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66467802aa---65821654591.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/93625788487.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081155d5c93a---mataxugubisifikotirewem.pdfIn PDF document text
    • https://lemanssrl.it/file/maziwevevadatinibodovoji.pdfIn PDF document text
    • https://digireg.sk/upload/93959829472.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f5ed18c5---palajibiwufamowekur.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0abba40f98---36660205525.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10956 bytes
SHA-256: 93b73c933a6ce689073a80d6a1c2e3c6a2177486c4ac1beed4bd0ef9efa40475
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 17172 bytes
SHA-256: 385fc521c9663a535ad11a14f9f0204523e9588c75f812d8b9dc152bc712e24b
font_02_sfnt_off00013ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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