Malicious PDF — malware analysis report

Static analysis result for SHA-256 76513a0995a9c79e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45499151d5344c982bda630035655763 SHA-1: dcaef23e3f0360edf627cc5285d7f96dfb37950b SHA-256: 76513a0995a9c79e848dcd3916447418157a1ed6dc6c134035bba88c0a6b0ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, likely to trick users into downloading malware. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=download+windows+7+home+basic+64', are designed to lure victims with promises of software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=download+windows+7+home+basic+64 PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8d5b4e70---18708575901.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0abca86dd---gijaraze.pdfIn PDF document text
    • http://bdnchem.com/upload/files/88637588844.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401dde1736d---51176286780.pdfIn PDF document text
    • http://beta-rc.com/upload/files/54809007649.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/91986858982.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/relomamusarabideti.pdfIn PDF document text
    • http://actinq.nl/upload/file/70044726857.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/dodaguvozakazowizaguk.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/taluduziwukusepavusafife.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/dolejosewimatoboki.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/27822840188.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexeseje.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/busitonefun.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kodolerema.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/totetex.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p82jnnlcif1q4bbudbrph2ki3i/gobelonugod.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/906943107.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/85829001828.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/pawekogupemux.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21c60256ca6a822d8fd8a8d3a4844fce/kobatawulogitaxaviki.pdfIn PDF document text
    • http://www.bash.cl/media/file/17000144536.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/67671965017.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_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 10960 bytes
SHA-256: e542eec5fd585089eeb3bf63ed6f42d3a8cdf421b888ec437fa6a3bdb51348d7
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16176 bytes
SHA-256: ad2e8793a86ea069b3991702feb533b8045ef2359420450c10423f66e1ed3c5a

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