Malicious PDF — malware analysis report

Static analysis result for SHA-256 34149f7c2fdb15a0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 18:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d421a4498dbfe2c12f00517a33bc7987 SHA-1: 28ae69c5229f97c64436b3b97936c2d82ce3bf34 SHA-256: 34149f7c2fdb15a00e2f8cf9e467718c45c932577dc8aa37777917f16e082943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee900704f9---bakogiboratosigafud.pdf In PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/natoworivixa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/149484016260e2941e1396f.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/rofaralaror.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/67370822061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbe74ea35---sujuzam.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/50602121861.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9dd5dc71---42420112261.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f2c0b4f65b2352779f9d8b2f1d751ae5/89539523147.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/939452630.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/44208071802.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pijunawule.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/17323838151.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/85757697542.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0036f3ad4---42383039907.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc45518c19---84593021541.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/kavujud.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c107b2d5efe---75723063553.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/buviduneriseralas.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pududit.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8184fcee21e6922109b92e2edd294a0c/wudonesibilutip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=canadian+provinces+and+capitals+worksheetPDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 17168 bytes
SHA-256: bbe080b502053a6623f02c284d9d280d95057a4a8b11177b2f457d107a16a1b7
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10884 bytes
SHA-256: 6d8d12e7ab0ee7848b9632a93ce85dfd3a5e34b3dc128bc2be44abdee58a9b60

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