Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6145fa235b33bf4…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 23:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82c4085625a22de09ad2e52e4125d0b5 SHA-1: 6b59da9915912dd199a2cb62cf1b16ce157ddb5b SHA-256: e6145fa235b33bf481fe649f7618a8ea73cc9c9b5776c96fddc27f8b8120d702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://truonggiangcompany.com/userfiles/file/zoroxepod.pdf In PDF document text
    • http://sinhorelli.com/userfiles/file/guxuruzojitofobewibojo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0d967623---witoxebebonufibafavob.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/8157452069.pdfIn PDF document text
    • http://cosyromania.com/media/file/28987664904.pdfIn PDF document text
    • https://seikai.jp/free_images/files/josarubozukunerowaj.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/netaxufotiloguk.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/20434582418.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/fusofovigizojubo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ef05066e---rusipamametopafuluv.pdfIn PDF document text
    • http://abnicum.com/files/file/91991050837.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b1fd9962bb74a320f9d09401c5f05f9f/sepan.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m6drf95ag1o4h0p91s8kn62bh7/zinosuzuzeferunine.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021082905024380554.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fupekefofujosijoseni.pdfIn PDF document text
    • https://themalc.org/files/file/ravawuxedutibojogesebeguz.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210615_66E315378518557A.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/4721691279.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/zigamenasajegugibepe.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074362400ef5---busagijavunofibedu.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/minijadutegadesalavebunog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=multiplying+and+dividing+scientific+notation+word+problems+worksheet+pdfPDF 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_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 11656 bytes
SHA-256: 2e2c7981037f6e4be2775535b298e8603200e0cfe35c70c1574125c254d3876c
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 17912 bytes
SHA-256: b240b419d4c779b2d388b0ccb84ccc0c9451648597f606533deaaee4a62b3d09