Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6252d86e971855…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 13:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33f45fcf09f2ca4ca35702c8a583bd90 SHA-1: f274880969da4f7e0d3029ca180fcdf6cf9bf1dd SHA-256: ea6252d86e971855b894a483f31803c628db405ceee9679810fd1983dd4b4b28
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 high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=deathwatch+core+rulebook+pdf PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93e7c89f---60140753181.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/54533899931.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/27780468490.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zagipudi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/93243253958.pdfIn PDF document text
    • http://plise.org/userfiles/file/3060411197.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/48377917664.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c8b20eabce96fac1cbe7dbb29f02bcfb/88021605450.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/zibigatinakukaseteze.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/91171147669.pdfIn PDF document text
    • http://fygl.net/uploads/file/141220355158.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/wawajivibuwum.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/falaregujukikevexa.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/49580850986.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/47466372735.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/59424492747.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/78946173191.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/92159641042.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xawatokuwukamefidoxik.pdfIn PDF document text
    • https://kuepancong.com/contents/files/26718747968.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e541c7960a161a3fdd84c309e0f5c769/puzazugasoxigi.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/27015210476.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/11302960434.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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 10772 bytes
SHA-256: 38eee5c20b97aeb74cf56d6a23edbd4ce49688cc07f83eac183f1ea520a45732
font_01_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 16328 bytes
SHA-256: b2fea4296fc2db84e7c22245b1f2fa99f5dd6d70e634b2a4de5dc8c14a9a5472
font_02_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1