Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e6ee29f2f7d1dc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 18:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66126c0f5a5890171621c3f59e0f9ee5 SHA-1: 0d5c2793652c7b509edf9f4f2138fa57240cb3b8 SHA-256: 24e6ee29f2f7d1dcfa8a2a198593b200e54997e31dbc396d18e8ca58093b526e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to trick users into downloading or accessing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=download+cps2+emulator+for+android PDF link annotation
    • http://dvg.asia/ckfinder/uploadfiles/files/vesusilotoposal.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/62203418230.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/ravajabosagivogefapaxi.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/47446601485.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/78985124815.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zaxuditigikeporaramixi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zexixofarovukasenora.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/fofuwenuzazo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a12fd0225e430da3a177e29cc882ac2/joribikitaxa.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/zeverugifodanobijaku.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137af0c7bc49---dofuxuzoru.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/55613348371.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/masibadasuwedazemo.pdfIn PDF document text
    • http://rotang.net/userfiles/file/66835650589.pdfIn PDF document text
    • http://ranch.pl/files/file/punosadonuzepis.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/woxoseverabuteji.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/17d52282fc52827d32dd8c659abadc43/letamabubekabab.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/jesuzefimagojodugejesalom.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/vineb.pdfIn PDF document text
    • https://songhong.info/userfiles/file/52606377300.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/92789252454.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/25017451394.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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 11088 bytes
SHA-256: 3c05bdd11f15c9c560b5c0231b436ad00d56ddab576b50ad9056d82cec89acb1
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 18092 bytes
SHA-256: f190e3b814b6ee33b0eb6269e0f618445fa3f6301c0bdf2602e741a6daf830a3