Malicious PDF — malware analysis report

Static analysis result for SHA-256 810320aaf31eba2b…

MALICIOUS

PDF

112.9 KB Created: 2021-06-28 15:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f50389e20495b8dfb06bcf35977ab02 SHA-1: 0870e55da60ae79dcd9dc42287e758a9bac9f450 SHA-256: 810320aaf31eba2b4aa1399c9604a440ae0494ba10cbf4dab0de8ee5fd4ade92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9794

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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a96ecbcb---basanokobekisaxije.pdf In PDF document text
    • http://musikpark-live.de/userfiles/file/jitodudexagirekik.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f010c46af8993d21a9f3f9b73e69ab42/45955519174.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7396c30db9---nodixobowozugaduwuvizegif.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/29389692548.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf75b4f5---91522989798.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/99540098811.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/xaredebugupuzuw.pdfIn PDF document text
    • https://lesura.net/userfiles/file/3578166219.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5537941327---88253687514.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/41794488384.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/82391989138.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf4c4aedb---laxokisusadezutazusebip.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/488d978c909bfc08c0d42851a220f1c1/92492372726.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdf7a7c27---61200065282.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ac5f8b09bdab9c52b1b5a32a00ef9be7/93902805670.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d558b39afe---13098974053.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889aa1304f---vefuv.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/80747544904.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/caf07606134f74fbc82aefdbdb15ad28/169889357.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3592408bfc8a59334a6d633b44ed71f4/14519746216.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091302c1ca76---59953678243.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f420cab66---89938342524.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/21113822923.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5b755d3345594e0c8c38d75e67545afb/satuzubetizurexadega.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fbb1a3a8---seponororiniwak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+drink+diet+coke+when+fastingPDF 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_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 11132 bytes
SHA-256: 6f476c0021b42a2869742ac8b98fd1419e2efb62d315465955152a584e64274d
font_01_sfnt_off00016fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D8 17304 bytes
SHA-256: 701c0a2c264508ea93e8e0e9f9e6de67fa5597e2494b8d3fe409f153c2c27899

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