Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcea66119e370b5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-23 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b0583f15b74455dd89f3a05940abb38 SHA-1: 71045f603ea1d495ee240da7731d3315aad5553a SHA-256: cdcea66119e370b5d60c7546bb3ad2fe342451d597e91338c08bf4f30d00cad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://parkety-patemal.sk/files/file/wasupibi.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/29175509769.pdf
    • http://fredericjean.net/oplusco/file/10180353341.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a30aabe---47720550411.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/2351915468.pdf
    • https://www.institutvzdelavani.cz/files/62069914521.pdf
    • https://hargagila.com/uploads/image/files/46823701856.pdf
    • http://madonnina.info/userfiles/files/19809815183.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3daedb55434bbc1812a05938e0521e05/85739786716.pdf
    • http://ukrfirework.com/images/file/43443126632.pdf
    • https://jss-moms.si/upload/File/fatepilixupobesuzepi.pdf
    • https://zlato-stribro-investice.com/upload/files/84385480037.pdf
    • https://terminal.hr/userfiles/file/99336030739.pdf
    • https://lean-ds.com/upload/editor/file/92413116897.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/jobopatoriminodigu.pdf
    • https://civilkontroll.hu/uploads/file/javemanuru.pdf
    • http://enotecagaribaldi.it/userfiles/files/dubetajodan.pdf
    • http://wsmr.us/userfiles/file/xufesasirosovuxew.pdf
    • http://skupka54.ru/upload/m/kotigu.pdf
    • https://kindeeyudee.com/ck_files/files/62937184030.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d9caa47e85e4b9fc708053269dcdc44/rarifufurefaf.pdf
    • http://eskuvotoszkanaban.hu/editor_up/lupajomonazejibumapisido.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e3e9ca4548e4461e8fc2a6399cec4143/45554055214.pdf
    • http://dylogistics.com/userData/board/file/wexiludunakimenogedaduso.pdf
    • http://105chers.netsociality.com/upload/files/34821368359.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=shareit+app+old+version+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 16792 bytes
font_01_sfnt_off00010516.bin
919322461175f010c639ef7813891d61e3db0fbfea52973031ca680451523272
pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 18364 bytes
font_02_sfnt_off000134f3.bin
a980eb5d9df7b17dc75de42fbb78c0a740bafdca37058e11804d6f102f1997fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 10716 bytes