Malicious PDF — malware analysis report

Static analysis result for SHA-256 c039f759d2b77817…

MALICIOUS

PDF

89.9 KB Created: 2021-08-11 06:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c442d3e0e8999a1618fcf918e379790 SHA-1: 59d1617cc2e58a61f54e1c339c9e4a5bfae16c7a SHA-256: c039f759d2b77817cbfff833de666dd4c71b863530999314715de48ea25842a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://semineebrasov.ro/printuri-fi/files/wevikemomavebanogavex.pdf In PDF document text
    • http://abwfinlay.com/uploads/files/78398447159.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/12a87bb39d10ecd0bbcdaa021855f709/6965126431.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/49879328639.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/53591365546.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a559dc9e582---xinisilu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac471a6dc06---67482857508.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7474d88ffd168a9a7141f5728ba9dc8d/labawoxurilovevolajopumoj.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/80522759109.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nizeruwegukufigojila.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075283049b91---68833865223.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/13782988733.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/4991142203.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afe393eb0f6---11232086436.pdfIn PDF document text
    • http://01host.ru/userfiles/files/93012279584.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sumarumivegafomewofudaw.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/97590168283.pdfIn PDF document text
    • http://gerocuki.hu/user/file/tuxixajiwimexibe.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/30418214236.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/15611404651.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb01dcc1a---degopelejapawibolikat.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/45789063339.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zasetez.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9f827eb76cf3f56d71edbecb15421ba1/zefajobezixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=percy+jackson+and+the+lightning+thief+book+chapter+3PDF 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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 16884 bytes
SHA-256: 58c2507aa0d435516f4517c9457e08f4344a7299648fc18f6611df4aea7d607b
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 11548 bytes
SHA-256: 8187b3c1427fad54a8c32d50d14a13c43c159dd4873d2c2e12ee24d9124658aa
font_02_sfnt_off00014132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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