Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6f30577de773d0…

MALICIOUS

PDF

91.0 KB Created: 2021-09-22 10:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b65667b120e31c6ce1180a87fd6e619 SHA-1: aff578c086ea9ea0aebfdbc68a8a4aae447cc456 SHA-256: 8b6f30577de773d0c12719b2924394eb82095611151ead38e94acd75191334f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards an attempt to exploit users via malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a2kat.ru/userfiles/file/19207692386.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/71909783741.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161358cf91d55f---89104667676.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/47426853938.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/dofobalujujon.pdfIn PDF document text
    • http://yoron.net/up/files/36257372071.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8b27f6cf59d327322b7249ea82b55fb/jotixiv.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/8328003961.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/vupawexumikifuliritibim.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614acf5c6828d---kanadamavowigumi.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/mepunolekew.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/vibomozutojut.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/26668916418.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/zoxadesolutezaziw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f2375c42---sixexemo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/puxelologosutog.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca92f2c23---rowigobekojod.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/gadoropagizena.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/famedavirudizefowapibud.pdfIn PDF document text
    • https://tarsiman.ee/files/file/fepusal.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/bopiwaku.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091606100973499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ormakal+odi+kalikkuvan+mp3+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 10696 bytes
SHA-256: d56988b003a12927e521cc901770038f3d9782082c24327db917b33694cb0a5b
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 18692 bytes
SHA-256: a3a2eab349b41306cbdf0cbc4f4d763ead45e8e428beb6a715ce65c08d4c3557

Open this report in the interactive analyzer, or submit your own file for analysis.