Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d91d2a675765b8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 10:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d88d51a897ceb52944a6bda0a50dfa0 SHA-1: b605d8ae4e858ffe16e1ab49959c56fc52b5df1e SHA-256: b2d91d2a675765b80ad76d373f5408b3c2325612bfe4188f6bb31bdd1798ee9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=d%26d+5e+paladin+oath+of+vengeance PDF link annotation
    • https://abcoegypt.com/userfiles/files/fipusesalapifudapotovi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8361402c6---bumuvufamoreposiwerak.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/dagin.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/sidiletimo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sugosuxof.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/83462956646.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/80356298114.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fivevinevuzi.pdfIn PDF document text
    • http://haki.vn/uploads/files/rugoso.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/28831431381.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/90312592266.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/zifesofovupotu.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/53927389695.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/dilatalupalejud.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/66882211948.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/53742582240.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/valodijurekipomibaza.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/92265974622.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613928d7426a5---65560719111.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/24007020853.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5e95fd7b0b7eb481fee43f225925e072/xiwajujiwudekaweruz.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/86659558871.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB90 17984 bytes
SHA-256: 5f88d9fec9088e2830b1dc198488f692641f46792e8080b1b11aae65e1e5fa0a
font_02_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8