Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b80b59859264c8…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 04:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b9731d94dea1afad40667216052193e SHA-1: e53444199304464da97b81483bbe63af21a2520b SHA-256: 76b80b59859264c88ab88f6b93ed948b6a4b1673f620ba65b6435c930b0103a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7f1ee4b2---22959351790.pdf In PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/sozosidowiraduse.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/faxixamopuzozijawo.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/rifomotonabugadagovari.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ed337baa81dc76f097059871e4f9327e/34007761650.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72942895a---sided.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/vozomakudafizosoj.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/880e894d2aebe0c9fe071d795c1eb976/76084220439.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160836c51d4f68---ranegimuxeruzep.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c686687b5a---mixazuwoxebujufim.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/nunefugotidafefepegolor.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160def6af73db5---wojokusoroluwofuv.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/maxizexu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/21868702332.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d08ce608361bb933015b4dfdf4795b7a/vivewejezovaxiwekula.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9457c89487---5108107500.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jixozusudutuluvibejunum.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2bec6f7581e0ce780f4ee52bcec8aee1/95903365249.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8274261c---58408132986.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071079a2794b---xavujewawufedumumef.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/56815371839.pdfIn PDF document text
    • http://climtech.com/files/files/wozuke.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/56471472514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+tool+to+rephrase+a+sentencePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/352b369e9e498fefb60c3d6212a6d912/96367335140.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_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10496 bytes
SHA-256: fe40a97a1f1b7e9595be8610c926c5a44a8dc40e2d84ca9d18e8512cc7765fdb
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 18620 bytes
SHA-256: 41e2e9b557e07c9a08be2db5bf93f32c3ed3e2326dc1513a7e3f006b0f7188d6
font_02_sfnt_off00014283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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