Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5733df53d634bb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 23:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4655c18c769e8c933fb60109aada7fed SHA-1: b9aa896e4f301026562494c6698e9d86e5ceb8a7 SHA-256: ec5733df53d634bbaad5f79a9c2f98438667c27bee559da7d6a9084c9de30355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress sites, suggesting it is designed to lure users to malicious content. The PDF structure itself is indicative of a link farm, a common tactic for distributing phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=montepulciano+map+pdf PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mf56ctu7i5pt6olinc0vkpooc2/67311429280.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/19807943680.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5955ebb66---29540119328.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8c490a7b---42248179745.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/9819034817.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/93576546206.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607433a219c61---pojuragawejefirubuzizux.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a859a52636---xaxojesejad.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b45801dcf136f6c6e0eb3b66403d7929/dasabaxunosogowibajefuzen.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915887a91ce---jevividusewubexavujinovu.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/30363251241.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52fce5974---22807593746.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8120cc4749---70191217222.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/basinewakasigivi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/16145301581.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a82227ca81dbe8ae0701923fea1bbf90/88863623771.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/13041156867.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f431c87b9a3f015aaafe7655978e085f/tixomalolidebufuponow.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac44830c14---jezajuzisizozepemol.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/xawedejopelafa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74d34ea08---21457695611.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/lavegiwiwivesifuxozuwobep.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ss5qdpvfvvr1ia0t6in6u0f4pl/jegosodozafemusasajus.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a7cbc4d176e1be511548fdfe9475cb4/kabidurebifuzelenu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/90966578848.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_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 20452 bytes
SHA-256: 82ebf33669899424e3d79ad22168147035985b28d9be6d0d805af360f892871e
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 10608 bytes
SHA-256: 1dec2152bdb2f039dbd3bb6820c8ab936a0d40dc85f113a57f46d8744f16298e