Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f28de1c1508f33…

MALICIOUS

PDF

99.2 KB Created: 2021-07-17 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60368296d303d317f4203891da5ff258 SHA-1: fff6826ccaa9f9bcce49f1d415ceaec79981e947 SHA-256: 54f28de1c1508f33d5df508d560524a7e8a7859c9c313d17793437a4043aaafc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The presence of multiple links on disposable hosting and the use of UTM parameters further indicate a phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/26286ecd37478d7223210d1e5f25db08/vulog.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ef8bfb01ecefc83fbee22dc79cb386dd/1417412070.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/20914183310.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef8524cbb2.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69566e958---fivurosurineredefuxuk.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/86343ca12e8ecd8e890f2a2f398f15ec/toxegejawibujusisewi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a631f73fe0f---77965796088.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb0539f9d---56784096104.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c5b2ed30377dae11cc2637ebf8c5a71/96385931869.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/25a9ff13e4aed0ca1e2c5c2ad680a84e/suvoji.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/64659343935.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6d1e898---xijavogofube.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65c16337c---wirixujorijudotu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hh3uvq2tak0uok4k830v956sul/laxeralufufimagi.pdfIn PDF document text
    • http://korytnica.net/data/files/2063123594.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210710080420564159gki2k.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e4452b8ea8e---pejinevopewob.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/94637674723.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9a158dfc111337ca16909d533b71c2b3/kutokibakiwinevitonilo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b97cc4a19---bagewisesiwusisijo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/426768ee97acb58ae653bc2cd234d6e0/kesedafobuzopelizipebenet.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lebavajowikazezob.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/71903398655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reliability+and+validity+of+scalePDF link annotation
    • 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_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 10732 bytes
SHA-256: da0812a673f2482ca3c64d2c1bffe2d79940d92fbc8c2eb8c3f4138978345a48
font_01_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 18616 bytes
SHA-256: c3dd5d0ab10c72e3f82871250a035fbb7c2e9e95d3f3d3df3b2552f3934e466c
font_02_sfnt_off0001660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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