Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f35eefeff4e4b8…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 14:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 566ce8c9510e90f1ee6c17a3734dbcd8 SHA-1: e9426ad4df1bb4a12dbc37a9e90d79f67213f51c SHA-256: b3f35eefeff4e4b80f92f72b9283955721ddbfb59e8bf1cb19bce66bbac6e86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute phishing content or malware through a network of deceptive links. No scripts were extracted, but the overall structure points to a phishing or content-distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://crysiq.ru/uplcv?utm_term=macchina+espresso+manuale+migliore PDF link annotation
    • https://baoholaodong24.com/userfiles/file/56768000436.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210624095005890.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adafe2d483---60632052174.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/munujixipipadalijinunez.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/milugojatevekukubunobuj.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nemupu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f1e88ceb---kaduzajivipirexuke.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0994c810082cc8ad91bdcd2c9c65beac/87962513348.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/73053995793.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef7711c27---supofamut.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/e4ubt4j3e88kato3akdhgsgj8g/83631941993.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/6341309533.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/zebufarunira.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6786276d---timawal.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6441f22e8---52568252520.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160948621acb04---sozasazudafumirofabunu.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/maxonemanigojelakug.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdd5f100a3e2164e8ed30ae305db0987/baxal.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25b7267e4---46690036524.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/laxijivajumofe.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/78453517189.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/31636192020.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/45081646840.pdfIn PDF document text
    • https://jotelek.hu/files/file/42453820446.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 10816 bytes
SHA-256: af4ee8570eab293b04ae248a546dcbb68013c0bb5323dbb14324869ee9db6dd2
font_01_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 18084 bytes
SHA-256: 22dde25bab9f24ab1a9a45a63a5852379c50d133cbf7c29e3fd48fa1db53e86e

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