Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e5a269a402cc14…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 00:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06933f7edbd2f3e4a6a94f4574555ee1 SHA-1: 8a77fdf6179e883410900c676d44d6292d37993d SHA-256: d7e5a269a402cc145deadb25a2f9e24f4f21eef9c5c925884a61aa4e634a8f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://tylincms.com/userfiles/files/berifimijo.pdf In PDF document text
    • https://valerart.com/ckfinder/userfiles/files/todelatavokibige.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sabuwemumutugadepixuvenik.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/648653da5e08197fd1e77f61d0662534/zuwemowodo.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1331359930.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/56931197574.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/bosenoxedijomiva.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/26940449812.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e793d75e1a---wubenimulot.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/xemibomapabu.pdfIn PDF document text
    • http://adveotec.com/img/file/kikexodevigirujuwevoxur.pdfIn PDF document text
    • http://lex.tj/img/file/58391414663.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/55697865143.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/52043175395.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/ladogajopijunivusila.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/danavateseduko.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/zezejegokitabosi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/depexejib.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/knp4cv6eqm1j7rfgso8rujruq5/49096729276.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614071d5b9c48---95210735437.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/80513310481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+unite+apk+free+downloadPDF 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_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 17316 bytes
SHA-256: 45e3dcdbd8af5aacc45394abf8e890ee499fec9ffc1ae81dcd82b8a9970b7d3b
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 10772 bytes
SHA-256: 883fcdeda089b1ebe583fcdcd3ce62a6c65fc754daadb1721332c7389e7dc626