Malicious PDF — malware analysis report

Static analysis result for SHA-256 6807d0e76057d99b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 02:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 555ddff62ad41d837e9376ee43bc142e SHA-1: 9ef718058bb212a8818d621cd77446084f5f76e8 SHA-256: 6807d0e76057d99ba51e0ecef8f6bbd1905ff4e1c65061a23fb4acdb04e5c70c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests the document is part of a link farm designed to redirect users. The primary goal appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=support+vector+machines+for+pattern+classification PDF link annotation
    • http://resortcrimea.com/ckfinder/userfiles/files/posukudu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/75315248516.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/63453005837.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b29e11c79548eba1fe6778378e082f8d/33324276208.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/sitadulomat.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/86066677234.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad9e78d70---36579649597.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/vukarul.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/40471898631.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/52615434918.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/waluzubi.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/86266774173.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d00d68493251f7511810237df3177ca5/kitusudinabefo.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/33125785362.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/47898347358.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/rosoruberunixalobudepuz.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/meradexeguzakonip.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/30363777069.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132667a6a827---43900880662.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_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 10984 bytes
SHA-256: e75dce16ad2cab0b135deaa7e9d1270c873bba1986f46cd170de0ae09b3e7d2f
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 17120 bytes
SHA-256: a8e6e8c665ec83b97e2e28a989ca4ed2b357703c17a4ca42891ba1516733eb9f

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