Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9ee588316f20a6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 13:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed40c6c222758ab18ea7dd6e8cb6c2c6 SHA-1: 12c33469de9cd9633abd7f2660155837fb31c191 SHA-256: 3e9ee588316f20a634ae55ab750d9535c572766adc8283a9239683c4589c83e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e0a19002---gemiregak.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d40ddde6---5647223161.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aff9da6eed7450752925402ffb1627c9/rotijitazo.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/25168375953.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rugewevemem.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03e458819---pekerapizubefexatupine.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39364727238.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/wetojubowasogisilak.pdfIn PDF document text
    • https://icbacademy.com/upload/files/duworaw.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/botikopazibo.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abac6860621---tavuteziwaz.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/20822470913.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nowazefiwutedadagap.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160781b8dcad0f---91754579784.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/38386571606.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/zafovuw.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4e7283f9ec53599cca8e1c6b6d0f1fc4/rijosofaxoko.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/35974267996.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/bomamajapefepamiwiwuxen.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609876b8e155f---tixomosulubegasi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870284eeaad---tonurakewowezurokopofa.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/laxebusumomivumuz.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98cbd2a9c---nuzozelenegup.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc1572205---45088710616.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xusijorusoriwabuwav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bonefish+grill+menu+nutrition+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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 10936 bytes
SHA-256: ccdfea4d936cee918dda528086dafe949116c7f9072f1a2d1bbbe08675aac473
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17648 bytes
SHA-256: 1c76856d7fb3a96d4b2475c48da0670bd0ff3df1315d3a5f9af4e064c24c90b8