Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b0504b390daa4f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 08:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3375f413fb3679890778b482c444e109 SHA-1: 90608cb67f74f1d66ecef0b8a59da3fa24b73113 SHA-256: 95b0504b390daa4f7f6d5a7517de3ee3f10f99915c6b0494e79b15136611af15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of external links, many pointing to compromised WordPress upload directories, and a visual 'download' button lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristics indicate a phishing attempt designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://mulroyenvironmental.ie/userfiles/file/takexi.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c7a44771---zafobibodobax.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6f707e7f---19109944379.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/wubefokunurodazu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7ac0068111213047c0987acb0896009f/90557767901.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/95257732300.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab5e7968092---15592242741.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de9d9079712---50648567457.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/dulib.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/75764371124.pdfIn PDF document text
    • http://jarosi.hu/files/file/zelijovof.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/liworusejixolosabisux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084adc683b6f---toretaxuj.pdfIn PDF document text
    • http://web5gstore.com/Files/files/41161541028.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/npgd0k8nqlu32sdbls3911vkl0/89213317395.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5929e5862e18d5cce751f9f3f4c4222b/28441373731.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607673aa5cc5a---76053455908.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/2846018392.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f4bf23831a6d3c4645a48b29d117d51b/sowametixanedidevaben.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9eda72fc8acda9499d8a59d467dc3a3b/poxilajumigol.pdfIn PDF document text
    • http://akademibt.com/resimler/files/ragalenuseko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=raanjhanaa+2013+full+movie+download+480pPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16860 bytes
SHA-256: 7ed86f1c2590798b4164e55b6aa21a08a2d06f4cb751684648393cb6ad88aa61
font_01_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 11576 bytes
SHA-256: dd521221ccfb5b8e8a1b6036202c7208a548aecb77653c8391834a12225603bf
font_02_sfnt_off00014460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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