Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6034f08f05ef8a8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 17:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ff08d15a688865ad870613b85f17c57 SHA-1: 0fd132b3aec8f69e67e98476dd4574b505a8a7e9 SHA-256: e6034f08f05ef8a8b6fa156d21ae0b266b8c2d5fdf671d76c587050a4496f329
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a campaign that leverages these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nguyenthaotech.com/upload/files/tinekufenezoxarebeti.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/86946337645.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/pobipojejudulurig.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/numoka.pdfIn PDF document text
    • http://ipllaser.in/uploads/lojeg.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/72723837814.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/30789083480.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/71861663432.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/gugaduzegi.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/gadokodiwomafora.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/21627fce33c77dfeeea11d0dab4ab501/40108639051.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/niziripomi.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/gakubatazulodup.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fowidijowevusasuma.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c49ggd7cklt6cce9na749a3od0/rugodimilupapewozixen.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/44456060494.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/19736546882.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0866cd17---tupojuguzifivakakitaja.pdfIn PDF document text
    • http://medrea.ru/upload/files/45325229817.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zanujudemuwabenobetutebud.pdfIn PDF document text
    • http://chpcentre.com/files/file/gakebosogamutipekixekoze.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/sawogenewadi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36abf5a8e748709e59017aa90acd348f/vimogigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=phone+secret+codePDF 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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10168 bytes
SHA-256: 2376471d965a9b48f5e62d2b3d86bdc0af486c7866aa1ebd137d222be1a4b39b
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 18312 bytes
SHA-256: 8a0a9796d578771213980c2e80fb7c98c351802f9bd2e057a0a296d942357a9d
font_02_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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