Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c9299de66bd338…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 14:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bd86a79e3a1344e7ae41e14fd18f4a6 SHA-1: c17750934b3e12a551bc4c1516cd243d6975ea49 SHA-256: 85c9299de66bd338173c05503394706fe47d4ba171797e965e30a9995b8c54b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including algorithmically generated URLs and links hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=shooting+game+mod PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad8fe98a03---75862887781.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/64751752283.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/voribodoxawafitepisup.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/garurane.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/xepogekirimeku.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/65242331070.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/5010516430.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vopaxosodotejake.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vuzorajedadebefefoxexege.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/sazuramaturokumovumo.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210903234830_1892198395.pdfIn PDF document text
    • http://stonebreaker.at/14226828290.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/76089958850.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/rofepusazug.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/32154279442.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/93615407690.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/61216842652.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2fc8709---39978066106.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/62324826759.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/dizosup.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/53f85e6f0f4ccf449e9147b00c3806dc/88035259415.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b81a5c0423836c9678b7c06b54ee7040/30532589230.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21614461011.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/77922833537.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/dikelozifi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/121244233453.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kalokanigivup.pdfIn PDF document text
    • 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 10456 bytes
SHA-256: 7250e9809a5151528621dc47a031d2f75ad83d47d7fd4c76a314b3b6d06aa42e
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 17356 bytes
SHA-256: 21f861f6873bb9f81ae5086dc2d3be656faa9ce601795731dd50582cc38b90ee

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