Malicious PDF — malware analysis report

Static analysis result for SHA-256 da107e00424e1d05…

MALICIOUS

PDF

99.9 KB Created: 2021-07-26 03:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8693596e60aa8759dce53d3dfb78de09 SHA-1: 8268fb762b1b03b510c671f55fd2d361abc40b06 SHA-256: da107e00424e1d0561e0586cbd599dfd236907d76cff602125028a3fc0afea45
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised WordPress uploads and disposable hosting. The document body was unreadable, but the structure and URL analysis strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2kgqm47nd1pqdfct66uugojih7/wakuvurasobir.pdf In PDF document text
    • https://securitydm.com/slicice/file/34987067207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57d06d7b8---puwerelur.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/o3sh27facak0bfoaq0528u15i5/dovenegesuxadumufekopedag.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/60357355123.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72021187602.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/wodulo.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/97306177625.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/panavuj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d706830abb---nenivoxi.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/49561415447.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072208a72001---9015033348.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf0a46deb---mufineromaki.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/aa1c380d995f9b39902b2afc1bcf4f7d/10143877420.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/devibezesojivabalepiju.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/fobitizepese.pdfIn PDF document text
    • http://simonide.org/userfiles/file/82315503475.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/52c518f2dfc263ed5e930f76a36b2525/42815972001.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/93341639909.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9e07ce6ec3830486d8507025cce570e8/18845034778.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/90377393500.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kur4an55knkdqf3kvgt5fhlube/kojikebobonar.pdfIn PDF document text
    • http://gyobel.it/public/file/55563822465.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tefipaw.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/89352765378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=journal+of+clinical+anaesthesia+and+pain+medicine+impact+factorPDF 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_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 17212 bytes
SHA-256: 7540a67ce5e17715c7cd129c308bb12303eb078b526900d2e42c4ba411e47768
font_01_sfnt_off00014f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F48 10976 bytes
SHA-256: 211164ac8d69f473b361f73f163e5cec02bfa431a3a5819e9d5095da7b2abbbf
font_02_sfnt_off00016891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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