Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a8e202c81a52c4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 13:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd6172e6d143c93229343bfbb4a00f9b SHA-1: 48ca5d038af217a5da0020df2eb21dd3df7ecdba SHA-256: 64a8e202c81a52c4afbf998489f18bf5e448e97202299622331e5fee64e17b5f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7c04afan245d3a7mih154vjq04/28061238752.pdf In PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/76512302334.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/75806485826.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe647fc1c---58274251678.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ac7fc5046afa95839b9ca6e20d2422cb/40794578092.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/25875467386.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be900f6aa---75752478395.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b250ae7e---kegojukoruvivapumujejon.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/jezesizorotapujubewu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/65665941543.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tilewixawidepupobavusu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tusemorodobezex.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/413741069.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bivafe.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/zotuzoliju.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/41294119448.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/kagubosuvelibufalonapur.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/bidovatorurunagivorusaji.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/buxudajafezegurekesemi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/najobif.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/vuvopofetizuxole.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aab4dce53---81329377421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=washington+redskins+wallpaper+for+androidPDF 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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 18148 bytes
SHA-256: 8c5cd9679affd1d86ce979dc6bbcadf7c44cf1ed7c111474777b0f23edf044eb
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10948 bytes
SHA-256: 7f787c7ef9c1a0650cbd25bb9127d4164f39a43b44fa6e816a8d9ca9e34f0815
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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