Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbf1342068cc108…

MALICIOUS

PDF

91.8 KB Created: 2021-08-03 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8d452ac73bc24b63b17c60a1ccd496b SHA-1: cfa0c5f22cfa47642f0454f52eeffecd004191ad SHA-256: dfbf1342068cc108f37d28b429306d0f137a15de4ab5af665c50195f963f1f15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malicious content. The presence of multiple PDF files hosted on compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aldurra.ly/images-editeur/img/file/zuvarosob.pdf In PDF document text
    • http://atallmed.com/userfiles/files/30013918919.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/41777397648.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d2d348ce00b3818a4c179e90a80073/zeleselabugad.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/99830127388.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22ad51d76---8584190501.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xijabagerot.pdfIn PDF document text
    • http://www.asslar.de/downloads/93829119506.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/56633047589.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/11505530961.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bb291a039a615045c8e9523db737dd21/80198454698.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/2875550618.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/teretedozipivagin.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fdec811ad---sozizolu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dffdcad3---84781198694.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/sixewuvufuvurafa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76826b08d---samibejimigupuzebupatagi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/voxelawabefaposipu.pdfIn PDF document text
    • http://berbun.com/user_img/file/dekonaruraxikixir.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f2427e13---wikekosedovakevit.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f5ad6762ddba59f412214a71f9e9b0ab/xegulezimovirufazimixezix.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888973abfff---wujutituwefun.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/13297864954.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/givosijaribomunajelavese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=partition+mariage+d%27amour+chopin+pdfPDF 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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10988 bytes
SHA-256: cc954b006aa52f38f5cafa75de6dcc414ab567af001510cf8782f03cca0654a1
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 21928 bytes
SHA-256: 1894a82b0172dc04e7d3b0c9b741fc904c660d5f9692cc5ac2dc49cfbb6959d5