Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8024c1ebecba14…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 23:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af473fa143e248eb146cc381b1f2cc30 SHA-1: d76a7143df2dc47e466f5a47e2504e15f4062c83 SHA-256: 7e8024c1ebecba14c9161c54e3d85e9958e7c29d8fd9c54e4f1bc57db993f964
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://ourcampuswindow.com/ckfinder/userfiles/files/22294972864.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/510990802822f4031307260a46fd0ae9/93862316554.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5kkrrlmmqustklgk4dijvov6to/22679054856.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/64135699916.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2uesg91eou0aeomb3euihl5f9u/54757434579.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/33234020209.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/20117760953.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6477153e7---74391457248.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/denafojiranoriwodilis.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/fajurobubapuwogafapinub.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/81978709318.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/95152525970.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/18349440933.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/83247703975.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_115913.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/reratapalabipafiju.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7c18bd2c---10020605666.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sanalab.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kogabamamas.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81892876240.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/xerinanabezotukopax.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/72179466672.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161319db1ad90a---19192499982.pdfIn PDF document text
    • http://dhf-china.com/d/files/tuvewirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=live+cricket+match+watch+app+downloadPDF 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10812 bytes
SHA-256: d604fb29a27cbd88fa71ea01fc2dc5f48cb67a142cca451abba21519ac269397
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 18428 bytes
SHA-256: 74dea1166319754bc6724d0e9bebd09fe09a9baf3a004f51b85c1816a01edd5d