Malicious PDF — malware analysis report

Static analysis result for SHA-256 87308967a45bc8a3…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 07:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14dc18f33fdded0b853071e47ac28674 SHA-1: 7fce006b51e35977feb6c1a9ca436be9bd74322f SHA-256: 87308967a45bc8a32a94b4f37c348adcdf0752b9e9bcd4d9abf6a0a8e6ece00f
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://ketchas.ru/uplcv?utm_term=fasting+and+exercise
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8d355fff---36906488275.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c03pv071ag7e4nfdenuq3v1314/47665914618.pdf
    • http://amadpich.com/userfiles/file/jilajizan.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91b51b541---3636588496.pdf
    • https://go2germany.ru/files/file/sujubuxeduxer.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bee4lj23ugprqh288d6to99ht3/dekerelidivari.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g90d2o3c19cd184oeuo7nsfusd/zuded.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0060a15d---88825866526.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/780c34c4d578cbc3be4c29cbfb5fb84d/muvexujukijasaros.pdf
    • https://girl0229960192.com/upload/users/files/77656981594.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/621fb97a402ca8c088046b010e6570fe/63974280800.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b5cfc87d6ade9b86ce2b89f6de7d90ce/37668110746.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3efe5e4c---ririvobokaxe.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc442973475---jafuxumavonudoraf.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbca8bd52---61425845187.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82e240c25---81074433276.pdf
    • http://fly.no1-yes.com/userfiles/file/meluwixadituwinejizomaku.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee97e29cb---saxekovomo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2137c4f981---zizedumomax.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b445cc7e---mokegesumifa.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc63952b0e---zibigox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
font_01_sfnt_off00010a01.bin
7a934ab30d66ce3e290d63318a5abaafb1dce4d5f558c5959d95986a2df9ee8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 17320 bytes
font_02_sfnt_off000136ce.bin
d7f328c8f9ae401be9234d3b39dfbcad684983c875380f5ac1ce3a3aaa794468
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 10460 bytes