Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b1afe9ff4bad41…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 16:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edcd5cf49b9b6bfa97697fe9880a843e SHA-1: 91127baf7ccb9842c5c4cb24236b05b337b85c9b SHA-256: 08b1afe9ff4bad4118b1e878af2a6eab1e85b705b796b5de72d00d6084c82d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://umiyawoodworks.com/fckdb/userfiles/file/buzidusixi.pdf In PDF document text
    • http://www.amedna.com/userfiles/files/36991763282.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/98625103691.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/62264231125.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/53748331434.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/xasugefijubu.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nofisebepesefotuwara.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197109343224.pdfIn PDF document text
    • https://kimcert.net/E/file/tuwabefidorejozef.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nanokede.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/patasovuw.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210916030139.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xedefilulurojobabuga.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/dofatovoralunadodixivoza.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_2CBB9545DE4E6C2E.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/pituwuwokipenopebabulo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/70838566965.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614239e823fcb---20256379354.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vikumakirulexar.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/sivoremezesegolaluvofufaw.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/wusof.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146f47d92014---49956296481.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u4p2lngdr5gqqfd89rfbmr97t4/41122309202.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/68044514171.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wagox.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613524501a437---53266194252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=first+person+shooters+unblockedPDF 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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10760 bytes
SHA-256: 06b2985bd329ff93249df093de6d452200e3f423ad3513caa6dee527c1b6c769
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 18644 bytes
SHA-256: 3483a2012b4fd3851b73d7d0be56bbbb357484693aee56d485a0449f97520bf2

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