Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb9e4f0800524b6…

MALICIOUS

PDF

68.6 KB Created: 2021-09-08 17:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97b2c4390131f846d36185e68eccffa1 SHA-1: 58af17967a1c7a3517b65d54ba57c60c9ecd1959 SHA-256: bfb9e4f0800524b63b9bd7a9e0014a056552d4a53bbc2723bd47778d7a2a8f7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Heuristics indicate it's a link farm on disposable hosting, likely intended to redirect users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, suggesting it's a trojan designed to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://vvpta-irvine.org/userfiles/file/43653325532.pdf In PDF document text
    • https://maria-galland.ru/files/file/folexevizekajezumop.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/13069071436.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/dikabigedokixibozejikape.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/watowojesevowatewavu.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/roxuzejamufubuj.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/75269510271.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xufubevobobubub.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/39530405471.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d44d449a6---77746231234.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/riwaxazaxolodifopi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4c98f977dfcae2c8eace3a251ce13b0/57499878100.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dirapagilipofupas.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/19642869685.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dozilizewafinumotuw.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/jigomipeteke.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jufikakorep.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/jivekudazigoviv.pdfIn PDF document text
    • https://jurad.eu/files/file/kabuz.pdfIn PDF document text
    • http://mfahk.com/upload/files/50712376681.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b3af985---90089549498.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d897f2a67---25628541997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=prisoners+of+geography+pdfPDF 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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 14224 bytes
SHA-256: cafb201b74892ae217d9b17aaffd886134df3815bfd60edc472248b816ff917c
font_01_sfnt_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 10748 bytes
SHA-256: 47676922f8f9ac7b36f8a3748b00b7afd8d2289b7c39ce5f44843c1ce4e7b4a3
font_02_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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