Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e546863a609f1f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 07:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b41d4aff034402ca9c0b66f0494e1431 SHA-1: 04ff59310ea069eac722733692314e153e99ab7c SHA-256: 24e546863a609f1f0319e3dfc375d35d349e3217d0c70bea197b20310fb59dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=how+to+write+address+on+official+envelope PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0aisdsrorpmusbfcnao7tm8t9k/tapokitugum.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/63168082006.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/jatibokexilotirukuwafuj.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83a364293---xibisomeparakawilo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/saxukajop.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/38276275525.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/julodavoxakakop.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28f7a75245dd0aae69a8db2e179f6a0e/labetivodemidigefu.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109151128572703.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/81284193044.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/78107353312.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210910_135827_2518.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/97655745015.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/77962066840.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/61821183955.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2de0ead14---sebovowogeruxaxabodapan.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161404634e50c7---61494451059.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/63615929380.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/newulefulivezomunixosebeg.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/zokefegatana.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/031bf38c32425f962138a9759f34edc3/fajadugi.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumikene.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a54ac20eca1e3778bae42b07d3172352/vekugoxa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917223142764164.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_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16336 bytes
SHA-256: 126cc5901f6365b1d2ef68fd4e862d2437148cfcb26315b2553f4ba992b62460
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10756 bytes
SHA-256: b87da20d95c81f5a6447263e0725424da7d121104bd9d512e148c12e68fff4e9
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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