Malicious PDF — malware analysis report

Static analysis result for SHA-256 e161eda4449b4ad0…

MALICIOUS

PDF

100.9 KB Created: 2021-09-04 15:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d98682e875e66c570bc9f15195d4ca47 SHA-1: f12f00c7d8afa6c9feec37a25f0cbb2025015102 SHA-256: e161eda4449b4ad08ad2bac26d3d170bc6bf71fe89bd54a9f59d79cd18b9d7e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farms on potentially compromised CMS uploads strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695f8d3083---50226143923.pdf In PDF document text
    • http://studiogiovannone.com/userfiles/files/vusisifisujotazazorewebug.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e737e12d---22323503743.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/45125038203.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eab08f6e4317a3f7ebaf9819e42f6e85/rotefokugexoroxajabapuw.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4p961lo22l3mbbmiauc16i1seu/56859242077.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/begopudagupi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7d999d096e51bed160a1e6a56b21371c/nixetinugoxifoguzoxux.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kupotofinosovifo.pdfIn PDF document text
    • http://renovator.cz/files/file/63985897335.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d41be49f5d4981286bc5d1c34ff43970/mudida.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/tujazaxunebozozufelod.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ducneqf1q15u89lon0bi967hg6/tujokil.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/48594663980.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/35253323763.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/7162626052.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/93551188297.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomozojadatewibagorafel.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/nrkt1qklf98jsio13e5n179m7g/46890442273.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/21297465028.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/94252890126.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e55774fb---84415054264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=soldadura+de+arco+manualPDF 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_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 21088 bytes
SHA-256: bea3df081a6ce46f770ac4e7210813b9c613f69380ac554b197399cbcc525e7d
font_02_sfnt_off00016e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E80 10348 bytes
SHA-256: 1b9d5ec170c8abd215dd127e40b365e8323151be5da61997895b1bb07495db68

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