Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f3ba51e9500296…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 21:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4206bc9ff41e73341b64a56230545a9 SHA-1: 7f1c45ca0e43492038e3aea37c13edb3d86b337b SHA-256: 16f3ba51e9500296ff1d17a6693d88e918b31c3efdcf009cc36dcb44b7843798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious content. One prominent URL, 'https://inwebjor.ru/uplcv?utm_term=mcafee+mobile+security+trial', impersonates a security software trial, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=mcafee+mobile+security+trial PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bee4d264f---wovoxarikavipidilawimi.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/13626230403.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hcp5viqg21qvgvgabgdcudkiqu/lemakakovulixodine.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/welezegojotuwusabe.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/ratifugilakufefam.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202196025412101.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/42618617328.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/sadavugosexenarasatu.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/famubodinukufuteli.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/negegikofokuzugimexebeto.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/potezizi.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/69352550124.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/pikiw.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/79152132233.pdfIn PDF document text
    • http://pjteam.hu/uploads/14217542574.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/98596038267.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19f265250---wivobofivaroz.pdfIn PDF document text
    • http://taociren.com/upload/file/2109120142369610029iboofr2dnr7.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/veraraxuxawubeka.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a2460f91---30680246402.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145f367d622a---depeletosufofidizuwuked.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13668843456.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/79506900594.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/jivoz.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 10740 bytes
SHA-256: 831b64509c0675272b97428487f6bea77ee8b631ac9e8a4edf23269ea6ded008
font_02_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 15748 bytes
SHA-256: 7b7536e40e149408a6ae1bd7550f41210f5578b9072ddc747b9df163a0e10776

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