Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d736fada543b7…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 04:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 035d93b9ece2820ed34df91f71a63474 SHA-1: d215970e8fb243edd72cb0eaeb7bf63f97b07381 SHA-256: f39d736fada543b7ed0effc1aca2f03a5cefb8864a4d3148766720f09c84573b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with spearphishing attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=data+structure+in+c+by+yashwant+kanetkar+pdf+free+download PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160888c028b3b7---xijazavopizavenurubobanu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ae50393a---birarivazekimasonoro.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cbf7531dfba27ed8b6c52450a1d9ddcf/nomojibakuwudibu.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/40810783614.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/xipelokojexumu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d64d1d4e72e253f235909211d2b7f773/19883026949.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087beebd6588---29014173573.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3876bd76a9fab4ca3a3f7cbd2b409c09/gigixokobitevuw.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558b2c7bab---daxel.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/91009308564.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946b0204915---xevipe.pdfIn PDF document text
    • https://hgb.se/filer/file/78416891559.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ubn2dngvc0n4ve9rsqf49vg03d/jitijegi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/qj2s65l4dek3dh8ltmo5vsmnaq/banidofadozoxo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e8a6e15e6808b9f62dd372949a6a0364/pemipotaxixoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/duvirokaxidusexuvu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d180a9df2d---tupavaporuv.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d981bb3788---50729084463.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff4fedc34---30276649336.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/q6d3kl6h8g41ll2094oqotvbf4/sevuvufed.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/a16av6aa022du03iic1r88ogl8/sonovevarejunibu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f0df91d8fea14f2d609feee1135421f2/tezigaku.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/55666771437.pdfIn PDF document text
    • http://asfalon.com/__files/file/bujejit.pdfIn PDF document text
    • 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_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 17096 bytes
SHA-256: 57ce1aff058d8393932af3183763a2b40dec298f0260781b9704a715793d4ab7
font_01_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 11252 bytes
SHA-256: 836ee55882851fbdac586549aed49581df95f3a47d819863ac201a09ff84a336
font_02_sfnt_off0001370e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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