Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44f907ef70776cd…

MALICIOUS

PDF

89.3 KB Created: 2021-07-24 01:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f6158c2b6d8df64e0cc72cff31e566ed SHA-1: ea26f04030c62923b8d0d764cb6bde92600ed990 SHA-256: c44f907ef70776cd635b4c8e24085336544b04eb288d0eb6d39344847bddf396
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://szintai.hu/ckfinder/userfiles/files/47608397862.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1r99l9coedfh6c5cquqnrkv9vv/8832148463.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/62652376962.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qugdcdolo8gqi1q2v01n91ugfb/vebefamo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/14881512685.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090968d22ccf---71564226394.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/24477604712.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/20643b84a06b11e7fdfaae26bbcefb07/wuwodipuwevizevasazodoso.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c3420ad6---4243976067.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/nefisagorurapepeg.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/radomobezolibupoxafevivi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qqb91d3kk42q8fpjgctif62i2i/kebimakozabetotoporizuja.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/77528285994.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080140648d68---palumolamotasabamug.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/tufibif.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxexarevewitusijezudetor.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/kujowejetuworujuvow.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/15224006021.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/xikopopebanofogozev.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/zivuxajifixevafib.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911ba94c50e---36730501216.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a1fcae4a---40919127854.pdfIn PDF document text
    • https://sambelteri.com/contents//files/baxisekizapidadajatol.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3e0964a7---gabowamu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bukebukafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+guide+to+redstone+pdf+freePDF 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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 16756 bytes
SHA-256: 28470d2a897e3a4cbc9315f719bfabcc351bfead9e7ee5fbbe75b25dad3edee3
font_01_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 10840 bytes
SHA-256: 5deee7910ac625c7c8871415f5c8f23546aa861af96c3fd4bff40dc1e4abd14f

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