Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fc7805896214cb…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 20:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 787bdf950532676f0bdeb894101c17dc SHA-1: df2543fdcb0f83f690666e7137712cf91b8b5b11 SHA-256: b2fc7805896214cbbcc2998d588512c9fdf21d7829e89e941d3d80f1067dbd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to compromised websites, many of which host other PDF files. This suggests a link farm or redirection scheme designed to lead users to malicious content, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=private+instagram+user PDF link annotation
    • http://jolanyee.com/upload/files/202109201913467979.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/fuwufepoxeten.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eqt6lk547h9ga02nq2rn1k2fik/98348498654.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/46731186082.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/86322780937.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16146ddb107bd0---53752333439.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/29967818028.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161371d87dbc66---lavakaji.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58651894105.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/japefabadoxiforuzonuseb.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/sutexemafuzurusemoruwipaw.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nixob.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/71113257612.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/22606134258.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/wuwada.pdfIn PDF document text
    • http://sinoorchids.com/image/file/13003054819.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/3761666915.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jivudozofilij.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/98159620302.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/coottfmakek47scn6o4kkek5eo/pimejud.pdfIn PDF document text
    • http://dongphat.net/upload/files/78417329821.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/26264267227.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_344A2CCCBF29F25A.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_off0000b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 14540 bytes
SHA-256: 8e462d509952b39596f1300806af81c8748b17b082502d89dfba5a6e0f6826f9
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10452 bytes
SHA-256: d21b8c11099d47e9e48252211f481cfc82af5d540aaff561379aeb1b96e8407d
font_02_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1