Malicious PDF — malware analysis report

Static analysis result for SHA-256 766cd024c85a1ecd…

MALICIOUS

PDF

98.2 KB Created: 2021-06-25 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6262199174c1d647824166be896ecdee SHA-1: 0f380934fa6c8c084f42e2454c4787a704358a76 SHA-256: 766cd024c85a1ecdf2a821744e60f10adfbce35058e1a2e1a9e3ff122ac2ab03
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e8bb80d---57166596954.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/48161764192.pdf
    • http://technocom.pl/editor/file/mifuxozenuse.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983264d4120---gubamab.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pgbf6pon8gbbbcvcu027r3qn0c/tibovalur.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/469d13dfef6f29c11a8cc25e51084e1e/81049469032.pdf
    • http://skolicka.eu/foto/images/file/runaxudixejewanebe.pdf
    • http://bright-mineral.com/uploadfile/file/2021052721570249.pdf
    • https://abeess.com/userfiles/file/70993960285.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d2d7da6669---pobuvenenuzixapegota.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ae7ljkp2pimuer48jrul59a2o6/sovaxetu.pdf
    • http://magnachip.cn/userfiles/file/20210516064641.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607befea1c878---48667649505.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607139b70d8ae---xefoda.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2819aac3de---muvuzigudow.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/15e87e02c9d3cd82c55f8ec2652a0c77/pabudatogigugowafonada.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+lego+star+wars+force+awakens
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c64.bin
7ac46fcb9b0a4c47e3ddda38f7919cbbc3082091f607187332aaff66c00aa485		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 10736 bytes
font_01_sfnt_off0001351b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 16792 bytes
font_02_sfnt_off00014d2d.bin
6e719ddbec6ce4860130ab2fc115db10bed45472c63f6575f82b080f07b50e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2D 18388 bytes

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