Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff6a395e3131f6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 07:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdf9c4b30e4670c26cf639f73679c887 SHA-1: e224a8c8ceec5f0b89dd0bc659db59331d2f503c SHA-256: fdff6a395e3131f666d73ac8afedba133049d2310a6d8040131a532d8f2c2093
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rikekitukokewiripa.pdf In PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zunidimep.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/227e645fb9a61e22875db571b27f6b63/29740453635.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/87157616043.pdfIn PDF document text
    • http://nenorm.com/files/files/50357540182.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/10073660268.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/sumivigubogajakogigodu.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/79773748905.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8282b992a---43945605592.pdfIn PDF document text
    • https://adikkedua.com/contents//files/goxefikaguxelikupav.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/37782857179.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zaretitoseduxenabosi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6d1424c44b0d0f32ac78863428ef3382/65161956186.pdfIn PDF document text
    • http://zerosquareonline.com/file/virumis.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3941a3b9bf25930685fc641d3b853c6e/5689788679.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2ca85a71805a144a750a32d46fedf79c/55646335354.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c2b1a1e831b5b2a9a04f3d7c17a773be/54807784027.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/mexosof.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/fatejotef.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hg664v9tqmacvmeieeeos93ng5/4471222210.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0e33fc98fdcf83b2b9fc075b22391f5c/2599067235.pdfIn PDF document text
    • http://rc-modeller.se/images/file///tejemefalarufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=epistemologia+e+investigacion+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 18500 bytes
SHA-256: 6ee90000059de0187cfbc036354d2c94bcf6b4b8f2b7e74407fe30ba89afe328
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 10912 bytes
SHA-256: f34c9965097300598bc17ae8068374e12a93fbd80f7945677f9edac7ae598df1
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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