Malicious PDF — malware analysis report

Static analysis result for SHA-256 3283c7914134c6bf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 13:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ee00d7116909138c159e968f55d480b SHA-1: a00b34da481104a1da6582b40251798e24d36ff9 SHA-256: 3283c7914134c6bfc8620a1757d6c72ec4bddf27ce19e2fc3b9d033b6562b053
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The primary function appears to be acting as a link farm to distribute traffic to these external sites, likely for phishing or malware distribution purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ateliergermain.net/sites/default/files/file/nubofokalur.pdf In PDF document text
    • https://giga-tronics.com/userfiles/files/lizul.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/37877078067.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f7c57d9f---22920283465.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/xupidamupidulonopadog.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/48323416127.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130688ca1554---63529546538.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/pegujekuzujorosaramujaxi.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/tabakilugeguxibo.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/61157429806.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/3550854368.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/rupamadigimeka.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/58830150417.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/welakenosulekez.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kidonagotekewedutevone.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/wagaze.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d0vuf9ckk5pjpp9qj1b66nnkr5/28883041791.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e63c10c52a125d5dcb38a7ff89ffd21e/60224226726.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/1130909439.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/nivevibofupa.pdfIn PDF document text
    • http://safarang.com/basefile/files/11157614312.pdfIn PDF document text
    • https://trexanh.net/upload/files/48180576363.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109070627185180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cartoon+yourself+app+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_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 18056 bytes
SHA-256: d143dfc708cef8f9f399d1704e93817537eb66198ebbdc0abeecf36ad160d106
font_01_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 10736 bytes
SHA-256: 0f10fdccf4b88c280e2e85c70718ea9d69debd6092b4326af9101645b7692297