Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2765e2318f0a28…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 19:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80319e4c8c2585d2e113b87d1e79462f SHA-1: d917377735bdff996b08b69246808cce777520f7 SHA-256: ea2765e2318f0a283956ca48e06b08c6acb0b0cc7bf339b9cf287ed4404d9a14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress sites. These links are likely intended to redirect users to download further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/bobobaxukanebazowadiv.pdf In PDF document text
    • http://a2hgghk.handylover.com/upload/files/lulisudemobezax.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/85358772797.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df072dc7a3---junudapumakizag.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/lovofuzoruru.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/pasifodoguwib.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/97672580900.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/87366920276.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/webadivararas.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lusatowaruxugoxe.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b59c63170---neluzeru.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/94900298064.pdfIn PDF document text
    • https://wita.lt/images/files/mototerag.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/18092926007.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/tubakekerotefadetexeja.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/20504239450.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/28913161343.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ab873ba2---tewaxufinazebe.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/78459856440.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nijunexesagimefijozadag.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zozeji.pdfIn PDF document text
    • https://ocloud.millionserenity.com/images/upload/files/40234769632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=windows+10+64+bit+full+crackPDF 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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 17072 bytes
SHA-256: 1909c7cdf7e27ccc71dd03d957b6e2c1c6cc30983174220f7f531b61a4e7c0fe
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 11168 bytes
SHA-256: 5136fe3fd60813214f7a318771b245fc4471f6a5b3dccd3b2eb2003d293ca1ab
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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