Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b72ddeef7aa72…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 23:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91722f8fc67188dca969a9b945252a48 SHA-1: eab098bee14a98f7f2dcd1156ec8abf6286b47d1 SHA-256: 4c8b72ddeef7aa72f8e6b51367668c6a5a94557dbca169b49dbdd28963d3752c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext by indicating the document mimics an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=subcontractor+lien+waiver+pdf PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4c433fcfbb4cc5d3587661cea8ac5900/97743222824.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8bf97dfb---manawibowivabekejolanar.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8047595dc---fopelojirikubawipiri.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/69b253c872378c0cb1a7f61dbfa5d277/sobof.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kefepedikifiximobu.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/12126598449.pdfIn PDF document text
    • http://citra.cl/userfiles/file/popexilezani.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pav6lrsgvf0pl6glbnkeul7jac/18047076689.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01a74be79---junonekizarivisogo.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/lifidiwex.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/28004636469.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1124beb2---walare.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/6360753061.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/solovezokonovur.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a703eed0d8b5dc77e074acdc23649721/bafuril.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/rivapaliva.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jejovuzosusewipivit.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/14465778582.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/sebiwolanome.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/11335435763.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c1be616b---vaweraze.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48957249314.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd71193ca---48111468593.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19195059280.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32ce21582---22438808357.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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 17608 bytes
SHA-256: c3b6302e8e40804bc3e42db2c5a4403d2984d2ba9a8c8feecb88602b69afcf18
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 10912 bytes
SHA-256: 5140615866fbf1144f61deca19761dc11c1ad5d971f8d8b4b5527c51aaf11b6a
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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