Malicious PDF — malware analysis report

Static analysis result for SHA-256 877cf2c3735b8fe5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 16:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 303dc11d596961b9c98aa7038712070f SHA-1: 572614412a8f71f0246a3181639a3c75020a6f25 SHA-256: 877cf2c3735b8fe5cb26cb69b5d6aaa2d67db6c03597ec0e615543ae2977c6dc
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=h+pylori+treatment+guidelines+2018+pdf PDF link annotation
    • http://thaoduocvn.com/userfiles/image/file/fupilovigilifanerabebud.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rimutomezenunidopuxowojil.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tu6bcive3dpph5d3l2ovvcv9v2/podexigopavanax.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/derorizumujeviwut.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/37866675120.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3cbdd7f1---vizutukulasaduwiga.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d0ug6mdu2a06if7kmitps5e9ha/lowoneno.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/4151444557.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/sinipeduxoxedunejokofoval.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c2d5c41c---52444232944.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dkm9hjltgt3721p4ef40f17t9m/kotivaredudona.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/tunosananiwutanilunuw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2a57dbdbc2---xudegodovetufuko.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/pemegidaso.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/busekijonaduv.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/62161725039.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f29d7807c---77801882025.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98259386090.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/45101283874.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b764a0e8c01c79b72bd2aad305b752dd/22916844366.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/95411595014.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/jotasasesizebew.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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 17416 bytes
SHA-256: a1eb03e771da8632525c6bb50892b9c9120c3bb2e50629b19b4cb5432882707c
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 11548 bytes
SHA-256: 5cf633b1b6ce40b29bac7cb820b15171ce67140861746c6079808c584ac17680

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