Malicious PDF — malware analysis report

Static analysis result for SHA-256 4905f7b2601b7ed7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 09:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75e16cdffa473d8570fead60ca971515 SHA-1: 332f9b29382ab4647ecc2493f9025ea5be8570ec SHA-256: 4905f7b2601b7ed786069b27e33532fd8fc6c31bf3e8046a4c8422f22f83ca35
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting domains, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlighting the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cambodiaangkorhomestay.com/userfiles/file/99707582514.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1db1ed96---kojuwokokupevijev.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gegoxipunoxibavuzaxuneko.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33b9fe7744---figadifunewalotopeninup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814abd90ac8---paxotavawoza.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/20003075140.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ea924cf---69048974786.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0bae8ef9846e72f581be4bc4f50f8041/65844026166.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/bejevatunigorodup.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215813834158.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/38493677439.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/87427950790.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/16990577757.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/84703773608.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/55680841651.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/tonavofotuteguruneviladis.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f36d9d74e2ceb6b96eb2270401207ead/kisoputuloletopamebu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/95873113863.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b37517d05d4ba4a928a56cc840515673/nabamamoguvebinapi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/122572ed95e95d0965b0bddfa6544912/796136202.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb5f4071d---fisul.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/pavudobupadojubovofomaza.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/24093477656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=god+is+holy+scripturePDF 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 17640 bytes
SHA-256: de0a709af94ba27783ffb0c55e04d0fd96e00c62006f3feda9372d1c85b4e11e
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 10600 bytes
SHA-256: 8c07e6e7d74a1ec37074048394ced64e0f901d1b7de363cd1d212306a827d066

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