Malicious PDF — malware analysis report

Static analysis result for SHA-256 907ce964c169dba5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9c486516f49588d22f0cacec0de413e SHA-1: eacbdecd314111682b477656ca26c903c0633976 SHA-256: 907ce964c169dba5bfc7a852de211576aab7068d17322659412cb32e13540c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wernitznigg.at/files/80103506800.pdf In PDF document text
    • http://trustarshida.co/cache/fck_files/file/kijorasinogefuweveku.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161365a2cbe0ca---kizufodozevo.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/jesamujaxuwe.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rigowopijexudujis.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393547704a2---10990963431.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/63268177064.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/90591487275.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/xavadadanukori.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252b28bf13---81329191860.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca33fdbf2d---butokukirixovibimujiba.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/gomepe.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/90023493330.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911061250.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/63745643279.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/lolaz.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/21097220908.pdfIn PDF document text
    • http://airmon.hu/images/files/tabotosamogugereb.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/95255348819.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/nejefanojunijiwimu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/zurazusonumumubejapagi.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/tinajaruvexifama.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/64980895617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+dead+rivalsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 21624 bytes
SHA-256: 5e799f74e4a805e70009835abd86f651925724dc2e1189adfd69a525e39ffdf2
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10296 bytes
SHA-256: de101bb32b3fae598a97c3e68a9da140896beec2bc71a3d7a6e1ededbd67003c

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