Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29cbdb68a14a61a…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 13:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d03383e816ec90be1dc0b6527fd7e71 SHA-1: 94cad76374b9b2a81859538a071e9ec58f3254a9 SHA-256: d29cbdb68a14a61a23070f62358af03efd5cf90cfd1fbbea16da2a9710fea4af
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to websites that appear to be compromised CMS uploads or disposable hosting, suggesting a tactic to distribute further malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious link farm designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://am-system.eu/ckfinder/userfiles/files/46335297835.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/92bcd7dc64509081c972f4edb7c8cd1f/lulutedozisi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e124da28c0---22791325795.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/64760041eccd041eeb0478a2ecc3870f/66212858123.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/ruxuvulufumopase.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210620130739_p5iay9.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/96948739381.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e25737cca---duwumulivurema.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/jefomibi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/tuwutotulimazewumuno.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zobuxu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71c82df7d---88809747509.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e49a66ff---75321808012.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/jajugixotasenatalureworij.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/14748279771.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/doguzurake.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/17ec531c7c58fee8e89ae1291ae4498f/39563169807.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607265e8db720---25833170359.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/gakisirenitekepame.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dasesopopotinatim.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/zuxeluvurexo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/78441454859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=basic+interpersonal+communication+skills+and+cognitive+academic+language+proficiencyPDF 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_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 11388 bytes
SHA-256: bc438810c5190c1189ff747de26382e7fb0a9bd432e407f23b74ec4e4177446d
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16900 bytes
SHA-256: 0e012fb80d76fa4ad1a87e423ac03a7552c5360871891327275839fa9f107dc1
font_02_sfnt_off000146ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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