Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c554003b379e9b9…

MALICIOUS

PDF

93.9 KB Created: 2021-08-10 03:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d337098513582105d75afb9e21e02140 SHA-1: 9b436042fb85ce907d844e25595fe6d0c32f7bd5 SHA-256: 8c554003b379e9b9d492155d90a68ae9db62044228b264b2ef4e8fcdebe62aa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The embedded JavaScript stream and the ClamAV detection (Pdf.Phishing.Trojan) strongly suggest malicious intent, likely for phishing or malware delivery. The primary attack pattern involves luring users through these links, potentially disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+to+change+league+of+legends+language+to+japanese PDF link annotation
    • https://childconcern.in/trila/userfiles/file/tejuxiper.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/tiliji.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/lagaxobifagesawodimugexo.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/51358430333.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/39833728272.pdfIn PDF document text
    • http://vizcsap.hu/files/file/82087844459.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/feda730f26090aa4c3ab53db7786ad20/fudipasikosa.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2b1a298a998321aa513c45fc7f5efed1/12066644039.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a22392ec18a---karovoloruxupawijunoje.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rgljoghkp43d1hbfcud21uviid/wedulokoxepefukepabo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848a49ace6a---nusilumizolaxipixuvama.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/segexidi.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/pidelaxorazoxejujigomazux.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vopubafoxagozoxezalepup.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/90843439469.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad51f738---18138149189.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/83783661097.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/ralitedonovakolipiz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5916dcb035---9596065623.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e71ba4b---74172582117.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96b5a4cffe509a08a339ca860362cc52/watisufasaniloguxopi.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/zemiduruwiled.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/tanojadugavatitofutukup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 2280 bytes
SHA-256: 044b057bddde9e148623704f7ac5cba8adf81fae8f1632c56d134c482ea07afa
font_01_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 11012 bytes
SHA-256: 31461e914a307be819d7aae9d53c54b816e8f709f44d2d3dfdcd0900d12ad4f7
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 17584 bytes
SHA-256: 019e727b76505b94b3504cad09f6471f51af01f83efdd8e3d53cef96b266b669
font_03_sfnt_off000150a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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