Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aba7604217f3cd8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8497c54d617a06a0a66a3d75af7a1aa9 SHA-1: 84300ec30434f7dc63040c735f2338a880f46451 SHA-256: 4aba7604217f3cd8dc15e4779514c7221ec186d2d2337a1dce36b519c3e5144f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and links to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=weiser+touchscreen+door+lock+manual PDF link annotation
    • https://grupo-kayros.com/userfiles/file/1825046975.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9ns5i4bl61d4d3ku8q8fpeolt0/kumiwokujamuberemof.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ccc7ba55f---57232283074.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tedipfpf4k9tphim5snh0n2v6t/27236545226.pdfIn PDF document text
    • http://emaaravm.net/upload/files/savozudasibemugadi.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/gufaxawu.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/webusamumoxodamotopif.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/mozowesozatakavezeb.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5e2480c07bfaa0ee557ac31bead0a020/xowodipomawugazejowuki.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/62953169238.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d440862454---57395546237.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/lgfekcln573di1sh8doipq1rgi/notepuzefavexalotegitut.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4fa49fa3---24252525568.pdfIn PDF document text
    • https://ikansambel.com/contents//files/jidurisapapizuwivilinil.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/53bfdc0c66f1585908994ba90d76fb7f/zegebewib.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50a876c7a---koluguvanet.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e41a9ccd9---kagukisuvevotino.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/domoku.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/jafawamu.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/vaxobemaderosutoxebitux.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/dabogeta.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079594ce6d38---46770499244.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/fopevokojezevetuseg.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 10820 bytes
SHA-256: 8bf37fe288f295a5ad1c467cd2c0af85ffc0526b1540720aecad2418d9e01e4c
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 18272 bytes
SHA-256: 620ac632bd245ea8a71dacbc98edb15747af6f74137d5235fd034545fef9fd48
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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