Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b13bbfa9b07529…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 06:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eaf43961ccb167f08b2eee38118c6818 SHA-1: 8ef7a586049bd0c49a0e72c3f700686337dd03da SHA-256: 28b13bbfa9b07529179035e878decd3c2dc4cb011a60ccf2777dda9f23c98457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=liste+de+la+layette+pour+b%C3%A9b%C3%A9+pdf PDF link annotation
    • https://egyseg.eu/ckfinder/userfiles/files/99909763722.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb2b9731a---wopodowuburajaxelinozudof.pdfIn PDF document text
    • https://tckontrola.hr/files/98075685632.pdfIn PDF document text
    • https://carlojans.com/cms/file/saniwusixebazo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fiwabunefanabibuguso.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/gepuzog.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2908f98646e55607a06b7de08670eb8e/42775554667.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/28ed918ab70978bd59cb82fb66d75f29/jokasoretasukakumolek.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72438983409.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/bolofobibejuzipur.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160946f7c71ef1---vabajibagibuzizofo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/85881dbfd2322bc5091ded8f888cc0c8/juwigesebo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/37a42b0835670c420f4417041ec9bd4d/74993011360.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bazujom.pdfIn PDF document text
    • http://kme-kme.cz/files/file/divazumipawedekikigad.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jupr45464aobtg80q3dokqekp5/41653309319.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14699813568.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/57629164641.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/muxitomis.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d882cf2dc46ef935f2811ffa9348395b/32201349333.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16117c2a2ee2f6---mugofezeru.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/35750099004.pdfIn PDF document text
    • http://vlajamo.cz/images/file/1841950086.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a484a1daf22---77910252246.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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 21008 bytes
SHA-256: c2909044bee897b208d0ab2b74076941b69cf1d1cc68216522b249a7223bed2c
font_01_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 10852 bytes
SHA-256: f34acf9cb8ff1099dd47ca6f3253387618bac7a29f063e285cd64e5252f7e63f
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1