Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb5ba7d710b38e1…

MALICIOUS

PDF

63.5 KB Created: 2021-09-16 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d8953a86ec1f40fe7c480e1f6baeb6b SHA-1: 8050c25da870ba3e4541df17ef92583887804522 SHA-256: 0bb5ba7d710b38e176e2a7081576b09c2d2727ac9c7504a3efded4c18f6978c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the ultimate malicious destination. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9481

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=increase+wifi+speed+booster+apk PDF link annotation
    • https://hchoanglong.vn/userfiles/file/fodesisebuvawinej.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/romovenagapawuzevo.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/nurenewefuwezozojetumi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/sawojaxiwupiwupixafumi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358f28795ca---45882031468.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/soruxedevupusif.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lawowuwasokelivopubezale.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/54215f6f5e282ffebdad7d26cd1aa6f3/subebadugixaj.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/35177822058.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/80942926841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c21b7aa26---87402122584.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/53265772474.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/zerukowidonazowojema.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rezamuwateforumesewowo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70392095492.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/rimutalagamexariluw.pdfIn PDF document text
    • http://toonesk.com/upload/lonidezexumerukekunetipe.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tozulivekosujevit.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/79655775314.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fekineniluzulifasates.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/nenaleniv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13991994695.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 10836 bytes
SHA-256: 1636446247151d1ac87b5aff3df4600323a94a3463fa0f947439ae0d3cbda15a
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 17804 bytes
SHA-256: 404b360cd6c42b828bb6db76a240fdfe257ccc3bc4474e104ef17aacffade8c7

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