Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf2175bf113b12e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: beebb950e50149cacb0000f2f23eeb63 SHA-1: d88e7bf9d2e275f8e1b7c20f40079852e11592e7 SHA-256: caf2175bf113b12e9668fa7c2d2cff964069de4ed45415663f703574a7097d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised platforms, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://refah4ter.info/basefile/hotelrefah4terir/files/44494188832.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141666bd553c---papatadidizarilamojewoxak.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/fulosujumawewobu.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/degavosenejusapodusu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/78587569345.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/57549249232.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac6e2f290---27155685023.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/bixigazemitudujigite.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/dinetoletiboluwo.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/tuxinogomelejinunizuj.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/60708535716.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149061d4c66c---71534959623.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/75385056781.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/sijirusobesebur.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rirexiwefibudawebusega.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613303d4b25c5---daragogukoje.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/rawetilobovi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/74233398234.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/26422626027.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/10588665078.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/5998765634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apk+football+tv+live+streaming+hdPDF link annotation
    • 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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 17512 bytes
SHA-256: f735ee19165af2a7a31b5bebb606b2fda31195b2e5f8f490ba204a3fe9c05921
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 11224 bytes
SHA-256: 419cc13e4923c967a6024601cdbd218cc7ba4ba8e002fac4b85cb845f60f4af1