Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3fabd4d93c9fa1…

MALICIOUS

PDF

98.4 KB Created: 2021-07-06 21:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3421725db0ecf2ef5d979c51c0bbefc5 SHA-1: baf59f8ced5a84ecf5f205597390307e8fddcde5 SHA-256: 7b3fabd4d93c9fa1cf11946933ba0c70254b790dbacaf7536f79add93d5c19ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 6

  • 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.
  • 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://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795b4e8cda---46228016871.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4b6c2f4d830ef70772e130676febeaf0/pidewifixojojovo.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36b1d48a9---41996488351.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/15469419253.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b43fa240f93932772d8d27401951ed9/vujukekawikagupelixefasus.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/69211650879.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/458323c5ff332eea25911d78da72dd46/modaserab.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vmacippq4607jq8f0niprg5ud3/97320247022.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3bc00f48c---69400196931.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824d185814d---3946578228.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/79059074675.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2a9e861e---36280263049.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/vifoxegarilojisasox.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41f505fd1---mowidewixosivuj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acace983ae6---30369591722.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cc3c45e---60283780716.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/83prn9hm19eavn7ilesppl20j0/nanizoxekiduxuke.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/nutofakasiwuvedajeredij.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1925c51---polakapedalurasegul.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/551698d5312591d96d95843022a0f2a8/bajajovuvatu.pdfIn PDF document text
    • https://puppometalli.eu/file/zebemasufabizo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeac96156---2820858473.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/cd80fa04eb20c9a3a9cb2ae981d32f64/81358426381.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6a6bcf85---81352264178.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/59445836024.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/14475032778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=long+haired+blue+merle+border+colliePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 17108 bytes
SHA-256: 9720c0cda4f17212f824f4e2d6e6faaebe8e1716157abcfa85dc5cf6480fb6f6
font_02_sfnt_off00014cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD4 16520 bytes
SHA-256: 17dab69886bbd3ec2a6b7f0b1d65c3601f0d4afd9e3fe3dca6a26fc3206f9cfe
font_03_sfnt_off00016358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16358 10748 bytes
SHA-256: de0374704333ab26e3754cc528bc07d7d8a09fafa55970cdec541ae58f009402

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