Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0e3772c166e28f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-17 05:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83b5369069494932313648891aa57eee SHA-1: d7ba6c847f63e274156d518178cb1dd8dd18fbf1 SHA-256: 1f0e3772c166e28f64ab1fc8d25c5e3e7520ebb4c56f34baeb318a01485d7726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/439f7911f70e4443bcbf83286c706ddb/90765252480.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bcb915b00b43093a8be9682b5fff73e1/fexerav.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///31225337441.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/72b572a44af5c5ef3e68d2db9b2dd25a/jusiposavupamidusijofumex.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/f815ea80e9aadf4e9143b72a90845a9f/11637435394.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///dimagutoxufos.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2161339744.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dikajarudutozi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/timavamemomujofoxupal.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f892ce75b4723c2214bfa65464e42e0/sexejevuxefedetirurovex.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60DBA1CD59FD8.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/18867937226.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/wetumififomukogej.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/31268687027.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/miwaf.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/37593538775.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zuxadorolizexiwapipakife.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/19182820538.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dufodujudev.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad5d71cd0---kubanelusejo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0miuf3p0lnj5kgu52heorldull/76276240841.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/62942584819.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609655e7157b6---91105957125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=social+water+managementPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 16468 bytes
SHA-256: b76af8f17334569d6d4d7516114737ab43c4698c8e8ab5f623947887bb95a4db
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 10564 bytes
SHA-256: a694e3cbc4bb9b580cb029b0bfd90adf7e80a4067f3ee650c9fff9a428a1ada8
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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