Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a455b7651d8bc46…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 00:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b80a2ad03114d28450274af600b7cf1 SHA-1: b76eb66d2cdea7f9014f8c11ed0ead28c99dafd2 SHA-256: 1a455b7651d8bc4600bdc26962e790e2d5253f5649cd20b14671e5797ab53f91
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, some of which are compromised CMS uploads. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rozgarnetwork.com/ckfinder/userfiles/files/tixuwawejotumeleze.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/60665291860.pdfIn PDF document text
    • http://changecn.net/ckupload/files/69524599222.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/luxabasoxulozu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kowinosizixulerepe.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/23069818307.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/rabilaxiwirare.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/49945992559.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce25cd727---fanajanin.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f792a3e7b55491d5e698eda3104594b1/58910840.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00f6976a4---8124414880.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/fizavi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c598b81a71---tonolevutijopixakeniniwep.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/040156255072.pdfIn PDF document text
    • http://raczcsalad.hu/files/paxagakafani.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/28775653004.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1438e4d66142e48c0c43e2d662f9b386/18914276369.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a59485be4---doloxupivasolelefolunulum.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cf7e55da---10685715413.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/mododuretazifavewa.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1rr5ebvh3u6c1hifmcq570l825/vutuxixazemefuxajokeboliv.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bbf70319fcc56437ac5c3b811858e68e/bagavajojowaxutobuzujabov.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kalimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=subwoofer+box+design+plans+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/40b35670f91f076349b35a418a47728d/vojezowako.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 11076 bytes
SHA-256: 4f2561ce52a44aa811fd696d087993643ea7633250e836726e658c9923c57a1e
font_01_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 17460 bytes
SHA-256: 6df827493364d35ab432c27f7bad956639c5d861e0f3eaf6515fad4ed3acf13b
font_02_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1