Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff339decbe70eb5…

MALICIOUS

PDF

70.5 KB Created: 2021-06-19 15:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7ab769edec3b2c7380a125b80aad363a SHA-1: ade9a2aaf35c4b42c27d920efaa3e4403b460350 SHA-256: dff339decbe70eb5dbebdf2824d8a8607f29d659ae517ffcea7a86d419e3406b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, likely a phishing or trojan delivery mechanism. It contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's apparent purpose is to disguise the malicious links by presenting itself as a benign worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b13da958662---mosoforoxebuxala.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072140734129---tufaxazijisodaw.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cd8cfc2447---liwadaja.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/putepazegunovedez.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/34965020840.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gugix.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b7b684683c18dd8f1fda3f6d61c58dae/21434088678.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/91539b9566b6bb47b9f6f90e4d856531/47704613108.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f095cd30---vejefifaleza.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/figawakoxinugafitaz.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pinasadiwepek.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/299chajmpr0t6oi4mscfb230m4/zegosejaduketurojewedib.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e360c66c18116b1262acadcbade7fc10/berotilixejetiwusegamuluw.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xabematoginixoleweganive.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0c5c6410---52870939681.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/bowefamevitawerejekoxevad.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098a29bcf6---34367118519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tracing+letter+c+worksheetsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 5164 bytes
SHA-256: 1676e60bfd0ee959da5747ff0fe56a02a0a733ba8f7572e3d12cf71d4064e371
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 11196 bytes
SHA-256: 7dbf47fb686d68b8312f86dc7a8d64cf98efe1e4c156816d89aade88af77ff97