Malicious PDF — malware analysis report

Static analysis result for SHA-256 be70db3c4effa91f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d0cd6f1f6ae0fcc95b21a48a6dc89db SHA-1: f2bd8ec4cab81d57ed56b43bdebd93987009a3b3 SHA-256: be70db3c4effa91fa1f872a4c7469b225aeee02794e7e03562addc53fe26858d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=excel+vba+worksheets+vs+sheets PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9ab82e5b327c56ca43cacc91d1cec59a/58166667450.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9nro4rbc033hlm64jsui2ffls4/60197686404.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/nuzeridev.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/popasoxurewulexu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76401d8b8---23145400399.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/lukumotepuzekexajuzid.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724f0cbc288---61685225142.pdfIn PDF document text
    • https://suksesunited.com/contents//files/busitufiziwuxeparu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0e720c077d0b888df39bd2fa9a618077/5383331099.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/77097975191.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799593d315c---95290466182.pdfIn PDF document text
    • http://tzsunup.com/upload/69947812910.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/54447587019.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5dcd8be9---nugewibusajamaf.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd73020e9---kokosaxevatanojed.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/xiseruzefakumile.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/doxovavugaxuw.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xabawig.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/79926198286.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/64662911446.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/65573558894.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/41734704042.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e56f9189a0d7a3496772464e3a1d405f/81516370051.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/42889581531.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/65402739334.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/temawenusomibogogavim.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 18316 bytes
SHA-256: df4d0fc7dfb612ce0dc43677c67d46655ab2132776d6965c5607088104f290ed
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 10600 bytes
SHA-256: 3d20a49ffe1e74704c6916277693396aff5b6b14635ced7e7b2e38908200e6d2

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