Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedbf34ecf23bd42…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 13:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22220fbcc8ec3cb7c86a0d3f0c9cdfbc SHA-1: 1a037dc4f1754b8aa368bf3583986befe6e8a884 SHA-256: fedbf34ecf23bd423e26f9430d6ccdf4898859d70da7fddae751b6a8f5e2624d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous URLs pointing to compromised websites, which act as a link farm. These links likely lead to further malicious content or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=romeo+and+juliet+online+book+free PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f913b6cd9---ravowotupisojepadapi.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/lexiwuribufavamedakoduvi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412655d4aaf---pibasugomolur.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/vukekurezawadi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6b33393ff8e17512bd5db41efeacdc8e/tagogutisiji.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/8885848474.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/10784284054.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/11418705883.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mojudagonupozevep.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jimepaxilo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e9a341e6f---pusijorol.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/52901467373.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dff8c035f21063b2a25622ec6760563b/31343250610.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/67389330745.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vezojivanalemolor.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/xetofesoned.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11485731989.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/24530349039.pdfIn PDF document text
    • https://cecprint.com/images/file/lizom.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/jokaxus.pdfIn PDF document text
    • https://gencatakan.com/upload/file/81473442918.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/nexonasila.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161428ca603e09---modarujubu.pdfIn PDF document text
    • http://berbun.com/user_img/file/67833601224.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 16568 bytes
SHA-256: 7cc5f491239c27534f57cc3588cdd97a2b34a6ec622a321dfc21e11685ced7c8
font_01_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10856 bytes
SHA-256: a9d01aa35e59790484fedb2055378e97d41b2cbb23addf6bd5b9aab81b5152aa
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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