Malicious PDF — malware analysis report

Static analysis result for SHA-256 764ab67899e9537f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 04:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c176af7c60f0608605865f14cd46b20c SHA-1: 435e7e70f700196f10ec583783e4fa284064feb2 SHA-256: 764ab67899e9537fa0524befddf435ac5ec1eed0a05127796167384237fc8850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, potentially for phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious document intended to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=basic+multiplication+worksheets+with+answers PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cd1c39cf---ripapowoj.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/47329492577.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xewiporavobidukujuj.pdfIn PDF document text
    • http://huimao.com/upload/bizibize.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5345e1c0---dagaril.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210803161428.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db562d504---zidusaxogabo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/68812751747.pdfIn PDF document text
    • https://ketoandongnai.vn/upload/ck/files/rekaxuguloga.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s8bpl7e9hjrghtmajcv2694asm/99885028354.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cd2f76a857fb614560de2762711e5913/98983811591.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b2cdf87f---wubavelapadajasowanun.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bikubavavanu.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/dizoravexuxuzaralajex.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160981148463fb---viwozazupulu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/27085639538.pdfIn PDF document text
    • https://digireg.li/upload/galipewenaxubonida.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80vevcs8e2ft1v9nmoe4rke811/29184295500.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/pobigigem.pdfIn PDF document text
    • http://opersan.com/file/paderijarajifaw.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xujekevilopa.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/88928964642.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/pufuzadodomaku.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h4rdbo48pfedt97bruo8sa9e5q/33366052824.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 19424 bytes
SHA-256: 8ce804c851f06706381433cb591d7d6b272fcf90f729caecb928d92ee4d3db05
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10968 bytes
SHA-256: 6a782f3e5dbfd0a6d573026354937f2dbb12ef47429bc1a40851500a4775bf49

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