Malicious PDF — malware analysis report

Static analysis result for SHA-256 258b34ca4b47250c…

MALICIOUS

PDF

101.3 KB Created: 2021-09-04 10:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aad825057ae6e75903ea4b6df7b6dc36 SHA-1: 14ecb47db40f3b073e42f32f4cbd7def9fcd3442 SHA-256: 258b34ca4b47250c2e576899a1d991f7a51ff638d4318c86840d489dd37f4381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/38ff2d680e7c81faad8c6d4bd2c8e62a/47068574429.pdf In PDF document text
    • http://hykylalumni.org/userfiles/27478819084.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/09c923da1ad110901a0beb37ef5416ae/24824284488.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d7e53176b---19391779726.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce56b0bcdf8---wiropimebutifixona.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ruvuge.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jedevusimegopofudilof.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/koxinoxetixuvuwidigezimov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a322e492738---39901883878.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/powofetigi.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/karuvituzadabizakavuz.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/74533718467.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/66076551573.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095df8a75da7---lidetarugapaxudok.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a133c7f2fe---59680545130.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366adf72f---56606982017.pdfIn PDF document text
    • https://educhina.mn/editor/files/49550075654.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30319e8ada---supawunapurewawugixutez.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90c51aea64---68713062289.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/54016330359.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/37508749475.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/dagijimoziwosodir.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16236071346815.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e09b5dcadc3847b0bc4e1d3a80c80d86/kuxovuval.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8080a72bb---xeretuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lancaster+boarding+house+walkthrough+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 18412 bytes
SHA-256: ad12a49789ed11647029d3d0e825ab4c09fc36506885d72c54b11c20bfa60158
font_02_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3E 11276 bytes
SHA-256: d807fd753a7482e11ddba78e6794deaa45c4672fc255628d6beed69b24e58a7d

Open this report in the interactive analyzer, or submit your own file for analysis.