Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41d26ac7dc576eb…

MALICIOUS

PDF

94.7 KB Created: 2021-07-14 04:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5cc6cf8363a05f0ee97f123fcb222d82 SHA-1: c713082c71078812ac55c1a24c6c80a1a3529737 SHA-256: e41d26ac7dc576ebd9ddf2baa97d5ea727c10d2ada76209c66062ec700d84cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6227cb83f8---kekidu.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/po4soaqhlg46ilkhlp6u5lq4fq/tujojinemexi.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/iqreb2ivj3e8qiqs68lbf3egqs/janaruwoxirokugoxilosufiz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b2677681---50781120373.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zotilenawovoro.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/75302132221.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d5adbdf4---70412311783.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/p2itc0ujsmgk6d2ftbmqhdgsh9/zemobizuzoxag.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f0527d72d24214e6e61c87c4ab028fc/35475915763.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/lagadazovevav.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/85341183604.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/rawugagoxeb.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/en8i0l0gndu5ef6djla00m8st3/dovulobamikino.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/75836152361.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eec408c7c684fe219d1cc064fe92f8f2/15883500123.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mqunajvnvfin8resjfj9bieoqk/zubogol.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ef9f95901---kegunodizugo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/jivowuvodufirakagatukever.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fimiganogasulubudugub.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/214047c7a70e75dff570a1ae72d7a79a/jowudesavew.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210616115236_858tvu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6612493aa78f0afbd014f4fa60dab482/89140591459.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14a757e9c---90971328481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=state+of+grace+acoustic+chordsPDF 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_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 17812 bytes
SHA-256: 7ba406cbae6add0c08be4b138a252cbd0a1de2472dd61002f03995a72fc0713f
font_02_sfnt_off00015524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15524 10780 bytes
SHA-256: 7f7a83e497d7afc4f8ed66ddcec3785a5582f3c3ebcfdebe69d1287317a16d1a

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