Malicious PDF — malware analysis report

Static analysis result for SHA-256 373884496aa88951…

MALICIOUS

PDF

89.0 KB Created: 2021-10-10 11:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aea0f97feaad9c2043c848ab8dcccb32 SHA-1: 42eb5ddd6d79bc53667870242aa2eb4f5ac2f396 SHA-256: 373884496aa88951f809d99a6ec49a56f3b8feaa9ef6b227d366825ee75561db
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=create+foreign+table+postgresql+example PDF link annotation
    • http://www.psoealora.es/ckfinder/userfiles/files/85473131161.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/xofevurupo.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/91349915450.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152863e1b927---munapodonetaramaladinekej.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1632085177vokarefodepisidix.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e058a25a64e2d9d48fd57f97dcfe6421/76297451606.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/12414609075.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/rogenanikefuzabawe.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/55197086168.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162710244100---23764512347.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/6032278756153e38fdff24.pdfIn PDF document text
    • http://gptools.net/userfiles/file/39311677751.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/tivolokekomeneborumo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/86037392015.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/15003446887.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/farofukepu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sowiku.pdfIn PDF document text
    • https://latework.cz/soubory/zajetuxatev.pdfIn PDF document text
    • https://euchebnici.com/img/file/fufopen.pdfIn PDF document text
    • http://npas.ru/pic/file/wovibapiwaxix.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/zijagatiwasozogozeboviju.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161628cf0d98f9---85551427161.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/65324026449.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/dufomikerunilosog.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/patewuvojiz.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 11120 bytes
SHA-256: b3aeb3875f6acc322ad61c81364c0d0ddcb54a90b278b70f86689d4fa357d1dc
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 20180 bytes
SHA-256: 24668cbec3ef8b5dba41a43dd69c8ad16d790b05eb9f2441202c00fb8628419c
font_02_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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