Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527b1f19d0f6b3a…

MALICIOUS

PDF

94.8 KB Created: 2021-06-19 08:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ab1b005f3efe6a9dec541f0a3f87b9e SHA-1: c70b5cfd9bae7c21891acd3ae258589e4fa9d77b SHA-256: d527b1f19d0f6b3a703b16c5f94b9f027edb563b126a96e8fa76b6dabd339876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites, likely to distribute further malicious content. The document body, though heavily obfuscated, contains references to a song download, suggesting a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10eba33b5---71609185300.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11dc1bc9---jiwigoropaboba.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaffa88f4---lixigunuja.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/kagig.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tazipifipejopuvoboxet.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/muridesedenunipitorutobug.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e30d250715bc44defc018df72fd18f34/45924858216.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/muxixowisafijununamutav.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f87b1bcc---fotusivaxuxig.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8292abkqgj7fugac00686mf6mr/ragetikufetipulas.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e5830ecf---rojuwex.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca48793cf---nixalulib.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mb96157ro89bkgrbmu730e7o70/82515939111.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/23ff0a595f7e92076645c5a86bd21e60/dofadileg.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d156503bdb---rozezulefipogafip.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed4122ff7---1129028295.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/521a76def155d729dbfa89aeec4f46c7/70782346745.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/989dfef3446d632ecc3c2bf4d664c3e0/16413199544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aigiri+nandini+song+in+tamil+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 5308 bytes
SHA-256: c170db3e7424a9455d2d65759eb797fac6cfdd88a95e6cfff6a699051db291fb
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 28964 bytes
SHA-256: 747fda93df27e96801c5eda09426246a6c1e59bc3e72310bdb0246f96cd8fbb1
font_02_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 10824 bytes
SHA-256: 698038a87ea99cf9d360b428dc27e97ed3ca2692c1bfda82a4bb51ad1a17c7ef

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