Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3b0d0a21ed53e1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e6489ec89ee1dd64f2135bc9745b8fc SHA-1: e7a52b0e2201c24c1fd5588157ebec944fb4e0dc SHA-256: af3b0d0a21ed53e19e215f25bad40d78029b4ee0eb59c60854c04599a030f480
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://childprotectionindia.com/lexcyberia/userfiles/files/52481672785.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/datekapun.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/59207260351.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/1928077344.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sf0q3sjnj2lo4gspgjads6btg4/36717870212.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tafesobagoxumolupukunusip.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mezosofowi.pdfIn PDF document text
    • https://tomas-music.com/contents/files/dofovuzixutozid.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/xowija.pdfIn PDF document text
    • http://staropolski.net/Upload/file/41171538644.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/33659388066.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3aedfeaa687df1ddfb0dd30a22e16728/simefek.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/manevusamanu.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/41641319686.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/29022261020.pdfIn PDF document text
    • http://exosushi.com/uploads/files/kedujuje.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/tipunepojubugebokavagaxit.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/juzuma.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/16809745649.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/26931887167.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/baxudoxetigalotu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/muruvewiteluferu.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/41782982863.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145f5ec7a378---wizalonogaziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+v+mobile+lite+apk+downloadPDF 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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 17296 bytes
SHA-256: 86e997d98585b8509052ba18c9fff4d06ce71726f1549a93ffd7a709ff46f870
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 10708 bytes
SHA-256: bea6bc886e986628346750f0ba290056b761bd60ad52347550c08dd7981bd0d1
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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