Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13cf353a248d76…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 21:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b447d650bf52e3bd054ac335a19934b SHA-1: ff1c3ac6fc8a5fe3258116bebc5e1532c00124f1 SHA-256: dd13cf353a248d765fdaf2ac91b170f6fe2a00d65a8eb39b454da43215b77f80
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a link farm and a lure for a password-protected archive. The presence of numerous URLs, many hosted on compromised WordPress sites, suggests an attempt to distribute further malicious content. Although no scripts were directly extracted, the overall pattern points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/l41c8qg00f5jh274prglau3vh5/zupiripokukejo.pdf In PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/wapasovibadoruw.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/vesidejitefexivekopijaxi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea71796ae22f41369f6cf8bed0ed1d38/fesawiturenegesiduwebodu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/45844831938.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4489514c0685acff54040a0a339e6e69/ketosagakomato.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b72b0716---98690537438.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/392pdrp7hket9nbd5u6lto7out/64790150972.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/73573708318.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/41269269336.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62924235760.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa//files/29135545968.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/370bd0a9874378c0d33f11adad5c5d6a/34569059082.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/dalemo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c827f92c44---90833371474.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c115ab99---xapujefuz.pdfIn PDF document text
    • http://askort.pl/Upload/file/xubudisexiwaxudusilojufe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/46829134637b1581b613611e27a1d34b/4675963794.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77eb125284---48735021145.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vejomexilowovabimokadaw.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/10gts984nafqgms36jqp3irmc0/fopivetezumibagofipeba.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/pevixididov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=baixar+conversor+de+pdf+para+word+online+gratisPDF 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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 17808 bytes
SHA-256: e3066defbd727062057fd126ddb8859187e0e1c91165aa53ed66fb4d1a881128
font_02_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 11104 bytes
SHA-256: aea2aca66de6fb8aa26f8968c2933a397f877a4547cc09563d9676ebb605f3b7