Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44f0a16fb1be5a3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 16:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff19316aa3603a7fffb0d87647c3c945 SHA-1: c62d077c72b03270e2ac8dfdd606769c5d7140de SHA-256: a44f0a16fb1be5a37e4e14331a97fbd732e104ab74b487adad01d462fdef983a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a spearphishing attachment used to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7773c007f4---rawiwolatagafo.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/waludugur.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/11681461532.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/45f7fbd1e0a9a799121ebb6a69ccf1aa/66592909836.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/daedd1cbaba9c4788ddab3608c421e6c/66824104410.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4121664381e42e6bc56f3902087ea737/vesometanipofuzujapoxab.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc7b4321e---viropuvaraven.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/damadifuvirilopasovil.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/bimodapowisogusatadadupet.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/88268544239.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fuwanorusimosemo.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/wadev.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b14fdcf30---95158792128.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/pikopofolora.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zimifosu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2742d460d2---16076719282.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/xogivu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/orpkpbvgsc2mrgshbqmaepij05/lajewosufepisaxidulax.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/lizunodosowap.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/jesitilewuzajifexise.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/44599364317.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9d1bc2e---80057089248.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692930408a---74797896729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oswaal+question+bank+class+12+maths+pdf+downloadPDF link annotation
    • 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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 16988 bytes
SHA-256: 5d922a1ce2496a5704f8b1d7d5957449e3959deccd6f78fee685b0be58009284
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 11548 bytes
SHA-256: 2091cf625a4aff36e57d1000828af4b47b2d172a8714c51f27ca2767b9083e2f
font_02_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1