Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef9def772eaac49…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 22:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c98a7efd679d01b779400caa8c90c097 SHA-1: 6646047d54a44cb01d60916d9ae40e737708d7b1 SHA-256: 9ef9def772eaac496df0255a8dc353f889cfd01385a689f876a042003a2f4e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed numerous embedded URLs that form a link farm, many hosted on compromised WordPress sites or disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=mi+box+s+problem+wifi PDF link annotation
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bugizuxenemamonofoxivujef.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/parivisopawerifi.pdfIn PDF document text
    • http://xhzhengli.com/upload/jasurododapapukonuje.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48909606973.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/89610700072.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/7707429237.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/40664610212.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135955f4aa3d---zegakikedesonimap.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/musobixemezuwet.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b4ebmcne02kreopvtrld817oib/61013933059.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nuwanaserivedarujas.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zejalewigokisegefapigarel.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_20_13_22_2790.pdfIn PDF document text
    • http://kisito.com/userfiles/file/37205427576.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/damufowuwidol.pdfIn PDF document text
    • https://kham.vn/userfiles/file/veferamojegusaxajepix.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/68695043352.pdfIn PDF document text
    • http://apvn.info/userfiles/file/vemibo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/lenifijize.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ba5afd0d5073aea912870b27813345f/nudimisidujorefenafof.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/ganeguweperusiz.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63588328982.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/72697273173.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/98774985178.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10476 bytes
SHA-256: 64b18cfe7c7b3ed972ce2cbf51983f69106e94c7379fdd160af5065f39f3cda3
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 17304 bytes
SHA-256: d5a79da85b658c10d959669012b6a50820598c0ab29755193c1e73473feae2ae