Malicious PDF — malware analysis report

Static analysis result for SHA-256 3312b74ea59d6839…

MALICIOUS

PDF

103.1 KB Created: 2021-07-07 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa4e821594f3f7b929b3ba8c2dcadce9 SHA-1: 8f664abaca14cdcea2884e554dba3ee537939252 SHA-256: 3312b74ea59d68396a09861231c6a0b8bdda5e3799d82410ed64d51ad8ff5624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://coretry.ru/uplcv?utm_term=valence+electrons+in+pcl3 PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a04db842---lexanasivamozisimuge.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fakiwowisolidafivor.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/adbfe8d8ab949d8f424996f24b40c5e5/julapuvuramu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae22d85e5---jewabelefafif.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/23612616634.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/40612067647.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/afh2cdc2itksf7tv8s6d51gl10/wadonuribegotixutibaz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d3d0a877---92463092221.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/33517780077.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/14532021942.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafe961c17---66913268516.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/92428686804.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wulononifemudonugimaga.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160703be76ae69---tosofoke.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c72bad6bd4a78758aaad656bb00bf7ed/mamevapa.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b02f40d22c---95491295319.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/91108570729.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5130cea71e30c6c59cbe6b423d768dad/31509073285.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947da4d33e0---juwijurudodudedisasu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094d20d83f56---43210290962.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f4e1b114d---wiruzawumujepanezitonu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528010328489531.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 10508 bytes
SHA-256: 85167f1cc4b53815b1488c094b1734f16d96c43d66e4b4469194d8058e82bff8
font_01_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 17200 bytes
SHA-256: 1516f9d19890cf9efad0a1ee954109116725cb2e11600a80c9de93b2307cc71a
font_02_sfnt_off0001615c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00017691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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