Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2cbc3d03edd8ae…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 400cc95607509f6c742b1fd9ffed9cf6 SHA-1: eb83933385a24b058d00e3c73fa5154bd9d6d4a4 SHA-256: 4b2cbc3d03edd8ae2394ac95f5de2c0847d56212ccea6739bc9604888d52dca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thai-apsproducts.com/file_media/file_image/file/gamoxipepe.pdf In PDF document text
    • https://wendi101.com/userfiles/file/64128514347.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/wemix.pdfIn PDF document text
    • http://seto.cz/uploads/46866432946.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/99362143123.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/ranewolew.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140669fda032---45968691891.pdfIn PDF document text
    • http://hkalc.com/userfiles/depuvusivafoj.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/49953694915.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/woxitevotudewawafejap.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb21b2494c---73753768101.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/menovedewutebuwimokiw.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xuwekivuxiwuwefuzomupolo.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/80413184934.pdfIn PDF document text
    • http://eksternest.be/images/file/kukaj.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/41563034548.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133620389dc8---93866674706.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pm7uo4pe4gvic6k88e1a81s9v3/repab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lld2ev77ap09ohofoblq1fdrb4/21382376316.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/gopubarukijijakowafeba.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/fojof.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/siradoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+samsung+phone+androidPDF 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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10748 bytes
SHA-256: 013090876b26ceb28779c9b959800b11f2b6d03747d2d4cdff2011875ca0e836
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 17620 bytes
SHA-256: b2202131db1db27c7edc551bd6fcf870910e916767786e3b18b3056f67fd3607
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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