Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6d1879a59f1e77…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea1bbfbc31a7e38a1dd4658e4160ac06 SHA-1: e1945ad04ac1bc2ad32cbafa1b44306003adbe8c SHA-256: ee6d1879a59f1e7734c4b475be628a8b1cafa668ba9f97c588846db6fc39519f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely serving as a distribution point for malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://altinhediyeler.com/calisma2/files/uploads/lukoxedunatizawiniwekafow.pdf In PDF document text
    • http://rdmsrl.it/userfiles/files/vupaxuvos.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/7lssa3iri58h3s9kcm6lbrp059/90680077404.pdfIn PDF document text
    • http://mavibusiness.it/file/sunewajurefu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d714fa03---57174287712.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0b2bf6fe---gamikegixonunabi.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/25408411428.pdfIn PDF document text
    • http://clingac.com/d/files/rizanuxizuxuzedilade.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/wavepevivapigedawagep.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/928505688.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/88965738243.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007558f9bd---vaserijiborewofiribi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53171918554.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///85046186951.pdfIn PDF document text
    • http://licausi.it/userfiles/files/tapuninir.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1314e41d---48018323190.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/afe6738ceb47f77b506aa184d255e30d/37313533973.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jomizax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c8428243d---68784936215.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/zamobusiguxiw.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cd0eaf4135b63367f63a2d42762fbf79/80845752200.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f56cc9818---zitepum.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/10114083513.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2atuhbb35n25gp52j8mb9o1oi4/lubiwulapo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756f3900572---40290080661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=novel+lontara+rindu+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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 18000 bytes
SHA-256: 7fd22266d13ed28ae4a3ff0e1419281ce9a34750b5cd58af2de5eae79a1ac727
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 10468 bytes
SHA-256: d7b2bf6a94d2b4bd5fea34f180095d3ffcf33a4062e9d3cbe7b99f750754b539

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