Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97031f7972a7aaa…

MALICIOUS

PDF

82.6 KB Created: 2021-07-01 19:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13bcc0124534e73faab121df9219a198 SHA-1: 9bf920fa5b0057ada78ac9c8a2645ba94c7c4607 SHA-256: b97031f7972a7aaa20ad1f4de6e39ac05f0c211f09245e4e5fa7e62bfe1faf9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or to download further malware. The presence of numerous external URIs and links to compromised CMS upload storage supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=confession+meaning+in+marathi PDF link annotation
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a25fa0b8c78---ripiwinozemukesezodunor.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/77463293792.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ae9b03ca3131a3a710fc111d4b71c315/20229210933.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/vefoliwulusivojeko.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f5f91ea6---roxipuro.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lpk44tlmi7idhp3b8djlk7iout/kakofid.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zibazejojorita.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/sovolifun.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/24591411884.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/0qt08t39k357u9lf40jv680ni7/8889559365.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609332a01d53f---wozefo.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/92251754380.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/96689587231.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/48259369036.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2433d14da---waden.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/1288368727.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf8009e73---susetibize.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/90006598940.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c474dcd2b6f---94895534383.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/rokudajunopexumerodada.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e89bce3---24683856815.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4ee8e91b90bcabd6c62fad2744829481/45381304892.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/tajukelodamomamomuxisutu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd8a3bbf---wexet.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/spf09klvtmqtvno3724rdmjapr/55834546597.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10644 bytes
SHA-256: b0ec0cf91f7d57ea27d3000992103b01c0038a1876c7cc360d141ba21ff168b3
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 18536 bytes
SHA-256: f1ba6f4262ab3a3030799b719a9328694e2713740e2152c0752db786a33bf439

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