Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fb67457b608fbe…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 07:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ded4cd6d03d1d60e43d1c71b7e7ede3 SHA-1: adb2db0ef694a5cc4dbb324f67f3ff5aebfc1c51 SHA-256: d4fb67457b608fbe257522e14ff582f6f4cc6a84bd43b26459df567dc21d30e8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting. These URLs are likely intended to lure users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://infrive.ru/uplcv?utm_term=what+are+the+differences+between+monocotyledon+and+dicotyledon+plants PDF link annotation
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5b6c7de5008f4a74b757020ab6d67062/pijewepedij.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98366085319.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vajifuvefewin.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/gukidevavupi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/timadi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/79101326.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/25556619816.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/werugepo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d3a66a25---rusugelitijewe.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tuziviruvedavipodagume.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/3646e4efc2a2641911effe7a42aa2220/57225380583.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c8936ce8---zojanozonimisodofif.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2e41ffac191aa0f138679ecd9b9aef8a/kawitujemowol.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/60614fd1259ac9f7a3cbeb7f3c757baf/nedotasezotiduwan.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/41529530212.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pimuwubutanof.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d3e399bb178f433973dea1b069393c79/18010522569.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/vagesoxo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/laborubanofulit.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267d4c4150---vusaxorolureja.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/861425cedbebc3d3905529a28a37edba/72074103826.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d33b22cb6c6f62738b01ae0811ef1457/82731091513.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 11216 bytes
SHA-256: 3c07ed970b2091e182cd37b776721213a09e762c3c3527506142b4fb46dda993
font_03_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 16836 bytes
SHA-256: 8b5f691dd4a62f68c916c656bb49f42bf2bcf32367d168f470243e3586e5eb87

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