Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e2458162b062f…

MALICIOUS

PDF

96.6 KB Created: 2021-08-13 21:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1b2d5f14fe4e3e0bc3f62333c26cf41 SHA-1: c6b000ccddf757a35f7d4c9695470ddf20b76eed SHA-256: f62e2458162b062f0d556b10e5f9f09d9be7c4492bdc6c7ba9bcaa53bf427111
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The file's purpose appears to be to lure users to these external sites, likely for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.awakohchang.com/image/upload/File/imupewumewoga.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e945c5f36---24815152236.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/5279866539.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609bceb3c7dd1---38414359545.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/7471164806.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/19541138554.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5c263f00a69ba6ab98e640ad8b515373/63785247184.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/6001007014.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210728004203.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/wosetexukorojubiwomo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/36855202852.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cq6bb9re69rsdvchv0smotrmmp/gowutiridutupuxikonafi.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/77774778223.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/pupetuxiviz.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/lezapaxupipibimab.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/6829831166.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acr079ip0sgj3bk3qn82r632c0/wanarogupekow.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/36606548365.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984be644dad---70664005519.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e3e98cc0---50261264473.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf5e03b7---zetozojub.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1aecd9a8f---mubajazajapotu.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/27173036395.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/riwegiluxilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+anchor+jewelry+symbolizePDF 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_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 11156 bytes
SHA-256: 6174999c8fd2c185b78a91add72fab179740cc9888c36fd7deba8958379b7497
font_02_sfnt_off00014588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 18328 bytes
SHA-256: 3e5d715bb0c980380e71734a02bce48ada4c14a3ecf5c0350c74b139b00042ac