Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf65fca5d9be4205…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 20:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 897d999f3968353c93ef1d5d3630feba SHA-1: 66b3be78fd7f5c4c1864d77303025ffe31ec93f1 SHA-256: cf65fca5d9be4205e4315079d0d3993fc524bfa7892bb3c8ce2e0512070cbc54
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/63e70051f2e6646a33c219903adc7f2a/gasuxigomelalidazotogox.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d82819ca4---74987844445.pdfIn PDF document text
    • https://hse.tw/upload/file/ladefuniravazazezowiw.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109031044486156.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/genud.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04f567284---zimotexipexarumivadi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608501f4a1940---42743154726.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/38110530179.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/9794155269.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/37185453899.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/joxuvovominud.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/57781455246.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/79473253441.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/tesofodotifugefowaxexavon.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/mazabifimatubovopebavosu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285f6a647e---vumuvudogajo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/805d99a6567e2bcb610dd1963a26d055/30137783432.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/togerusodebipe.pdfIn PDF document text
    • https://sanagustin.cl/files/kadedalulomafuwan.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe9b3d7811---54968169668.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/xefowapin.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/26667641415.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/lesotup.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xaxobadijifezu.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/bawiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=architecting+secure+software+systems+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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 17104 bytes
SHA-256: de2fcb28468c8810b031ba3441ccf9a56108833d03cc34d68f3dce0cc8d819af
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 11300 bytes
SHA-256: c5503d9592ebb913284bd8ec39dcf2bdb0a0b9052673caaef1ce474bdb5cdf03
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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