Malicious PDF — malware analysis report

Static analysis result for SHA-256 39508cebd03c6c06…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 20:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8eca94c4cf7bfce4c24eb7abfdc70932 SHA-1: f4392ebdc01cd8bb161961c13583c36942f25d3d SHA-256: 39508cebd03c6c062864a473890a1175798045ca317c26e7173263d964d980a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis suggest the PDF is designed to lure users to malicious content.

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 http://harchovyk.com/userfiles/file/4250264731.pdf In PDF document text
    • http://dongkoo.com/uploads/editor/files/13834055466.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/gowabi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/59599581385.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/f527gmium7oqtba2dk1pa29iu2/15904590539.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8814dab4e---26949268503.pdfIn PDF document text
    • https://latework.cz/soubory/79904661001.pdfIn PDF document text
    • http://deauville.ru/files/file/fupiligusima.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jjqh074lbcd5gt5jdijm392ot4/xexeposedaloz.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d8a6e798b07e5c4afc0a016dcba25484/tujosikopumedopo.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/tidolejurazubozemevizux.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/totowotezuvugegusuxiril.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6t3ak7231kgi8g107m1kmk7sg2/27779086775.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7dc083307c3ce3f9b0d0a0820e57956e/wokosazinuv.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9d30195f---fodawefujibid.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/37005136677.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/fafikalupudovuremuxa.pdfIn PDF document text
    • http://artospace.com/pics/file/mokedom.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/rugatimepemebubovefivu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/47704919577.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6c4de1dabce216af634df06d42bdbf36/25838663682.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085865fdd48d---vefijo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7gt3qk3m957rof99if453jaoa7/leleruzorurewanekok.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lolinif.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8bf191ccf55fe5f6b8ab3b8a048fb093/24621166989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=good+spritz+for+ribsPDF 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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 10284 bytes
SHA-256: 205f26ba898cb44dad8b0f8b310a1955b13656778f947994ccbdf9acf2df2df3
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 17504 bytes
SHA-256: 94397792babb3bc13f6f4d21462e80c3dfe2630fd9fe0e46bb03d35745b922f9
font_02_sfnt_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1