Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c525804a39d80a5…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 00:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d695bfbd5d62757db7dad747a95a281 SHA-1: dbf248c48d576cd89d4706534c8d0df2cb2a5f65 SHA-256: 8c525804a39d80a57ddc70c07d5a8831b94cc0f9eaeb5be8605dbabc8e56475b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown URLs, suggest a link farm designed to obscure the final destination and potentially host malicious content. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/09faipf9s83f7f0i5ah9jtuadr/jupisom.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37946ad58---95711738597.pdfIn PDF document text
    • http://armanetti.com/images/pivotonej.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/fivogupixobefelutedibu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c341a2c---36892481775.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f9bb4b1bdadbf5084b12b4028e4ec4fc/vagujelogisagologun.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/28017152556.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/fubifupu.pdfIn PDF document text
    • http://charivne.info/images/file/vumalegelimafetowasiram.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozatetaforeneg.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/29674529868.pdfIn PDF document text
    • http://scantech3d.com/files/kefupugow.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/waxem.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0c7228fc---pikewenoxozojadu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pegid.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a182b885ed7---bavutu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/37171786574.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nitaga.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/lelagexupitofijo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef02e109aeb9ab773fff0662cd7732c1/jedizag.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/kuritebiraso.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/69672815971.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c04bbc9af67fda7fb8f73017a47e1be4/mugasigaxopopir.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fezemubinirepaveforew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=assure+you+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 24336 bytes
SHA-256: 2f5f6c3be72ff89e26760855be66fc97652cc560680cd0b082104f0334e6572d
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 10504 bytes
SHA-256: aeeab419a88065911963683bf0688467a064541f1c74035a504b1a76a7910e0e
font_03_sfnt_off00013bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15402 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51

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