Malicious PDF — malware analysis report

Static analysis result for SHA-256 af913f6f481d2823…

MALICIOUS

PDF

93.3 KB Created: 2021-08-01 22:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48ee4bdaccb018e4794db5af573df944 SHA-1: b60fca31359794d58ddab171cf9b0cd630717676 SHA-256: af913f6f481d282360b2d5106859a02fece0bfa84bc85ff4df233e29c03ad561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://oniceh.ru/uplcv?utm_term=spectacle+bigard+des+animaux+et+des+hommes+streaming PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e386ae1395---wanilaja.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2322cedcbe---lowogofavuj.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tepimapes.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f3e00c038ee0db1ca357b510de01d85d/nojapawukiguvefubadifoz.pdfIn PDF document text
    • http://ruihuitax.com/files/file/34606265304.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/27360140650.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/mebasidodoforugawokovizab.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/jalugutadowinelozudol.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f28390b40dd---16194181349.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/koxuzokijilatudi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4fa3a652---10643685726.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/58087447102.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77c575a9d---jigonif.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/madagaradomisijevajame.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3f36a73311fbc7f960ec9bbfafc30c85/68078178616.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d714058---27885617427.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e3705dd---26845647267.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pinewuji.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/82781187978.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c49195ef8---gegakewakusipidedimuk.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41ffa05cc---3740429632.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/808592903.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/kedunonosusidizezexesafo.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/vipenewopamem.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/bepuwozoru.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_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 11376 bytes
SHA-256: c9ad3da0cd638e95b509b76bb8f3fd55b245d701b28b4195cb05d2bbd75b5315
font_01_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 20532 bytes
SHA-256: 4f34b9375caabcadc6c78e4576b5259e372dfdd5bb988313298f11027a8faf36
font_02_sfnt_off00014cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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