Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb088114ef8cd50…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 12:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c8e85b551734c6eb0cfbf8927dcc757 SHA-1: 2a168ebebc3cf6e77582149cf2694ba0714338a8 SHA-256: 0eb088114ef8cd50e22199ba89afcbaf7c00465a5e1ebef737d3579d182a95f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://timnhanhonline.vn/upload/files/9307573834.pdf In PDF document text
    • http://vetusmeter.com/images/upload/File/52088521982.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pomj490fshpuq9b0ut26k6574k/gukepefu.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9aibtvabcmmugco4hmg6so90v/30579730760.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142f79992bf4---givukenago.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/lonewaxuwutijepirop.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lizetadozumotinesupolabun.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/54365401562.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/70781889868.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/sopuxojaf.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210906213836.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/ritalidavegutogeduwonuf.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/sarisovikikopowikeje.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1574e8cd2---92255975284.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/laruxegamivapi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51886854340.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/66802455012.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133aafd7ee69---1843875215.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5998c5e2---latamef.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/punenaguwodavumi.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210901235734.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/59773915917.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kesoladalutadib.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sofedele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=powerplay+in+odi+matchPDF 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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 17988 bytes
SHA-256: cf946f1031a6ba140ec5874938ed917169aa434114d7d823c564ad090edc946d
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 10812 bytes
SHA-256: c454166efd19b2e0168ba21f78d84ac94f3936d3e57256313d4a06fdc6caed4a
font_02_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1