Malicious PDF — malware analysis report

Static analysis result for SHA-256 079c8c6f904de58f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 654fc63e70633965a7c581eb35cb4ad9 SHA-1: 718002176d745c0bbacfc0ca64ac0c72b2fc05cd SHA-256: 079c8c6f904de58f42e13db82786dda75cee33d587f2d09414576ef4f7d328d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=china%27s+earliest+civilization PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6139629a1---tejerusajidewofu.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/mudupide.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319408c3081---75432331295.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/18026147891.pdfIn PDF document text
    • http://mgrima.com/files/file/74341468229.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bibavid.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kodefonizanam.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27000151357.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108312254046905.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/ketuko.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/96620924268.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/jasijefosedabolojuwu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/11559709289.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb276c7a---pekopebofex.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210904180424146.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/91700091040.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/86201163729.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/23258780521.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/bukirikajejulupevege.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/sinijogupixisexoko.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/tevosafobekejadumutewe.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210910_124725.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/pujap.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/mexaviwivowosopazo.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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 10516 bytes
SHA-256: abaff225d715acb6df34c4b46f3782253351682e2aa4fa3d7eca2484cd57ff50
font_01_sfnt_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 15668 bytes
SHA-256: d8831500d5dabe2797b921d8b16225ec8a7ce83dbb558755d538e6de9b7ffc8d
font_02_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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