Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ab9ba5f465e97…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 20:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2726d98fb7282b63dfa91e469bf28e9d SHA-1: bcfa2fa44168c3e07871a25a40995167d1f02d6e SHA-256: 5a2ab9ba5f465e97bb2b6ed367bc9aeb0e8f1716cd204f2de0f192236a04ff96
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 disposable hosting or compromised CMS upload storage, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=chapters+mod+apk+unlimited+diamonds PDF link annotation
    • http://tokyoracing.hu/userfiles/file/vavupi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/remurumedezenig.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/12543613437.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202198324113341.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1fddad95452a157cb98bda570965130/86566092043.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85264755483.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/70404864590.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/74220918641.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485f10ef18---47219567624.pdfIn PDF document text
    • http://ridendo.cz/files/file/52026001402.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/5155244719.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/79533633428.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/livod.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vozobalilifibabevaweko.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/94282640588.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/mazugudibatutulekukowuk.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/33610793436.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161332ef256057---35058222636.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mukedoxobol.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/15415097490.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jagesojajemezeramufaxi.pdfIn PDF document text
    • http://gro-felix.si/uploads/55030555677.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fememug.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf620e10---93438890396.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_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 10880 bytes
SHA-256: 65040166a8b44d785657d2bda5495f7b783d45824d5cd355a94f77f1855cec55
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 17248 bytes
SHA-256: d366321e21b0eb94b633165a2939e7baa6653ea0fdca64f05dd62f4f199da614
font_02_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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