Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b302b70e6423859…

MALICIOUS

PDF

75.4 KB Created: 2021-07-04 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 12686e3a052f4325adac5582b8cc4147 SHA-1: f3d4b9aa44891f428826c6cdf12d0bd3e49f6919 SHA-256: 4b302b70e6423859dc443cbd5d7ef6fbab7fd381f6a58d4fcef97fa598fb9a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it functions as a link farm to evade direct analysis and distribute traffic across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=how+to+draw+a+people+easy PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a2b9eb998c2428c3580d90e365f933ee/95077221659.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9b06c2c---84859421722.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/844dfbb6a730be2ee4da98834da26ca7/jibefepupapa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcca08a7d---zivifaresikizokela.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kuoc503rtor9dkv0n8k5rqa58s/xubekurabepijasaradefewiz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dbb9362e660b4069539a65ff33507b41/40768135037.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db471a7fa0---52390350166.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/53241037905.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a6f3537a44dbbfa37e270de44db27956/rapilokilunixepalep.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/29a34003e0cb11b8e1283e32b36d372c/senugomigu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sufodopigokurunega.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/ludoludiduwa.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/61847806335.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd86ea524d---74506242806.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/61028594351.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/puk19e14aqtthq59idrmj7urj4/mixenasowubu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513607d56---9365788499.pdfIn PDF document text
    • https://majubesar.info/contents//files/duruludenisodamewe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608454db5681f---nedoguwenexizafeza.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e72c8d1d---mewum.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/31728179304.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/doxemoribog.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_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 16684 bytes
SHA-256: 975d8cadab7571fddfe9b2623984cec8a3abe726824474eef37d29cbfcc5685a
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 10380 bytes
SHA-256: 2423b5b5087b86095b72cf24cfe9fa1627ebd6b50db0663e31543f191a101067

Open this report in the interactive analyzer, or submit your own file for analysis.