Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8eb5d28abb392e…

MALICIOUS

PDF

75.5 KB Created: 2021-07-29 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 731871212573735a95b41e6e224a12fc SHA-1: e459fdc287ee738e2957115519ead1e1beb38d9c SHA-256: 7b8eb5d28abb392efa96afcf8d919875c9a18051c1c7567beffedb06b6aaa75c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://qtjdb.com/UploadFile/2021/05/24/file/20210524_212039_119.pdf In PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vman4hgtcjb154nnlbruuge8n/19713798351.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13960c0dd1---67007453186.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k0ir9vf8mfgp2u3j3v8jvke8l5/tuxenego.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/ranivudipulimevegetotimo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jupopov.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70e38b34f---galofivegatuga.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160792db82b2f8---78499636639.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e926f18eecc---12073975885.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af12582dd---filazaxolaguzigapudal.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/30429078758.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/62936233051.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/saratebebesegusanixiw.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/sipenovibudorowanofezoto.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608381e72728e---22027641140.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/saroxofumanesavesav.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/rozazexer.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/183354bf2d3e8a3f6166a7abdb6bfe9e/81337353238.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/9160195805.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/89386808027.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/ragibejixameturexotes.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/kililoli.pdfIn PDF document text
    • https://kermanrooz.com/img/files/pefafukijuzexe.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fegirefefalebofitow.pdfIn PDF document text
    • http://zipansion.com/1DnDuIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manual+de+mecanica+automotriz+tf+victor+pdfPDF 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_off0000c0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 17280 bytes
SHA-256: 6b41dc4e8c2fd9840d8e601377a42fa23deed96b7c76eec10e0280bba67a9293
font_02_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10832 bytes
SHA-256: b922122e446e3a79bdee7228c49bcd19e823ee9af8bc2bfe1753676c16abd181

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