Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98342127df3cd0e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 002f526b802a6b30e98def841dbf6dbf SHA-1: ec4bcf334e345fcbf8d67f4fdeb3a0faff2604dc SHA-256: e98342127df3cd0ea2f086b726d56866a305fe298bdf16f563c47deff9727ae5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. This pattern suggests the document is designed to lure users to external malicious content, likely for phishing or malware delivery.

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 https://prestinireedcorp.com/userfiles/files/22732332923.pdf In PDF document text
    • http://stroytehcentr.ru/images/file/fekomojomirakilaguta.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/24tvnjv3ci5gml479va05kslr8/74967929536.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/32819566801.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pefaras.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8373382d0---jikusapinikunaw.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/76930629362.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/guziwagaza.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380baad63c9---35748593366.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/65117210952.pdfIn PDF document text
    • http://simoncaulkin.com/images/fafujepasobaxasuxoxig.pdfIn PDF document text
    • http://wdnederland.nl/file/15127664632.pdfIn PDF document text
    • http://eva.am/files/8a7982b49d013946.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/83143704673.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/139368792613e97bc900d3.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zopatisoroxikejexojukutu.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/63476923325.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/todugibisakavaba.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/71757246164.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/verebipi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/pumawabisusukisagopoxusu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/51b04a8ba478f96fa49e0e73fa07192a/xiwukegejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=korean+app+store+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_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 10328 bytes
SHA-256: bdeac2466b8b5d8e703eb311507b6954fa25adef7e03c6076542a99a5e513952
font_01_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 17972 bytes
SHA-256: 1dfe342fe03f0c944bb7c0b40164b91b43abfca585e4e6022cf402168b22fa47
font_02_sfnt_off00013a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1