Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6576451e8cf43b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 03:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7249eacb7590fcdcc5f6d37246c17573 SHA-1: b4702f8a13d1702235d448b5c8b839822f222acd SHA-256: 5a6576451e8cf43b4c76e52b1af5c83c3e9889dc1af1194ccd9dc8c903fce08c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The presence of a link farm on compromised CMS upload storage is a key indicator of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://west-holding.com/userfiles/file/94516983185.pdf In PDF document text
    • http://worldnaturalfood.com/image/upload/File/48101519384.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359d47bcc3c---72672374565.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/gajagetuxoxaz.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kiturawadogogeral.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/12775179218.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xotalujevapanitosonog.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98759149550.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532f971113---zemedobokonobote.pdfIn PDF document text
    • http://debten.net/UserFiles/File/1251420905.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/badimubipin.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nisadenawijovopa.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/812065571.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/63dd5ce73db9c2dbecc6b041b446d42c/1606820758.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/badopefoxaj.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/160058485861331689cca42.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/zepafunasume.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nelazoweze.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/buzuk.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/42515665692.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/21589129197.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109160010542363.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/lifefa.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61832133651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=good+platform+games+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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 10880 bytes
SHA-256: 9afeb1313b78a8ab93e96c7ff16d816e063b34cf2a2937099b80f7ee0a458eb7
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 14980 bytes
SHA-256: d5f4fea231107cdd6662902ed1b113db6148dc006d5de41fde3669ee49df4e56
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1