Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef299e97bf85e4b…

MALICIOUS

PDF

108.9 KB Created: 2021-10-08 17:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46690a2604c7a10c8f7616d1bbd880f2 SHA-1: 16b01b9b91f24f0a54b7f9d0491737525564a7d5 SHA-256: 2ef299e97bf85e4bdf3ab04d821efe285651e565c0c6dad07c09a0c74a0e218c
156 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 phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=stella+gold+barrister PDF link annotation
    • http://cascad-trans.ru/files/4267079730.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/91726806469.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/numajevixokal.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/17071305362.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/wogawumora.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614749c9e7316---41968481557.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/75753367097.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/59515976217.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ce98q7ml82q6u5o5b14m4iqor5/65529952485.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/sulorav.pdfIn PDF document text
    • http://surestegc.org/documentos/file/kidowoj.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/ketedaxodozosibajikibepa.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/51369495392.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/xerudufitakilikefirojija.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7448758149.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/dejurol.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153b8e873501---11393431560.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wiwifakefazajovalajepo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/jetiwemudositobowujeraxe.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/68989568289.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/nafuzunit.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16325811006105.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/duvenegigugisosesiresiv.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/69812451963.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/baxatikigujusil.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_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 21864 bytes
SHA-256: 5ac191ef20182817abdf15de3eeeb397b721bede7321736534656d8be7031cae
font_01_sfnt_off00017617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17617 10536 bytes
SHA-256: 33b3c84643e991c993b8a204ed11710d9b81972ed15d583f836a1b8355cc0f66
font_02_sfnt_off00018df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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