Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdb7f27fee6b60a…

MALICIOUS

PDF

105.3 KB Created: 2021-07-15 10:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 968e51d07abdb0336cd60b2dc709b6be SHA-1: f5a03a41bac0a784811834543d440caa2feec858 SHA-256: 3bdb7f27fee6b60a902fa59b50b881cedcae8b0720b16a853c2ab4dfaf44cd25
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates that the PDF is a link farm designed for SEO manipulation, likely to drive traffic to malicious sites. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm the malicious nature of the PDF, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://medvor.ru/uplcv?utm_term=textbook+of+oral+radiology+pdf+free+download PDF link annotation
    • http://kurpinar.com/img/userfiles/files/gaxat.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b210dcbbb3e---40355861905.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764e6142841---96613138076.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/wafifopurabijoxof.pdfIn PDF document text
    • https://cecprint.com/images/file/76632319581.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/3486433997.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/45452164356.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pumelanetonemedojaru.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5151eeec---lezafun.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089672956b07---33644104545.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kukovusa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609607d0cbfba---21363250821.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/55kn7hebshr3h9ia1qki9ioaq2/71631016606.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d336fb3f---xusujajutovudasema.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/82795605150.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ev4pdl200vffgd0kh1slf5234k/mizis.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/85336501502.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b14c7b98f---26144619329.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kunemodemopipuxo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1d7cbdca---joleropiparijafoki.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/monav.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e41fe6b22702704f8343c472e5724e3/tiroriwitavizuzuw.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fusipuwonano.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c871e37fa0d---wopawowuxodopumite.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxedilugovefekizo.pdfIn PDF document text
    • https://ivanamihic.com//files/jiruwivexip.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_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 17900 bytes
SHA-256: 3192aafdff7df5ae7b0c872d435a8f1465a049035b11b11413e20c540423e8df
font_01_sfnt_off00016660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E77 11004 bytes
SHA-256: e6899569857c8efec351732ce23e41863bd64ef59a9f637072bc1eae27b7868b

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