Malicious PDF — malware analysis report

Static analysis result for SHA-256 b944248e907e9663…

MALICIOUS

PDF

151.9 KB Created: 2021-09-04 03:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3ae8b7ff806a359dbbe5335d0acf6518 SHA-1: fa177c60d1095ceae04a873f4d3dfed9c1e0037f SHA-256: b944248e907e9663251474b37e3f9c20da36b42e643fc670a0e203f8e24f4e53
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, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://infrive.ru/uplcv?utm_term=honeywell+t451a1132+manual PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f944acf3c88---92712479459.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/881e869d07f54955d47e321af5914839/gavudabifapi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c055ef3fbd5---89400786026.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/581db5297a61073612e993712a49fd8e/siwupinuxudetulem.pdfIn PDF document text
    • https://vitanov.rs/files/709908498.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/84061575683.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/iqoucu2d1jlp9umcudc53g869j/2745295352.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/jezanolefalawaloxutu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250551d901c---50254991381.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/31967766043.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wujexabifujeva.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/ridodijuz.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e7253f9fe54ea167d8e45b60f6615414/43221518007.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lamutetuwoposixatawimem.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/59054408642.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ef0d9d7c4cf4d89239d97b7e3124be37/45343915114.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/83122862995.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/boxoduzulawa.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/runeb.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a3c3b3a3---juwigusivomunepejari.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11accb43e---levegofiguni.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/letukibefotamawarulefesu.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/90aff1603e994a25451962844dba5941/jijelijisufazida.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64d999dec---54427436553.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/42418016288.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/rofitaru.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_off0001f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20925 10756 bytes
SHA-256: 82b617d51d15a0cf31fa717060cdca20a656210b0244faccffd59ae9becfe653
font_02_sfnt_off00022213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22213 18192 bytes
SHA-256: 59074d35bdd275de475b3681eafc467549fcffb95f97ef3cee78852b3847a543

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