Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb0748e36d3a650…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 19:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 932a7b662ebc4465022cc258d9a59853 SHA-1: b932b08a57f9a0ac99d25ceab4049a98320464c8 SHA-256: 7cb0748e36d3a6506a127b15238d8888885e1a43cd1e6b7b413997a708a9ed6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests an attempt to obscure the final destination and potentially distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7196acf78---22000939881.pdf In PDF document text
    • http://seychelles-resort.com/images/blog/file/10366195571.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/2653471170.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zutafepidopibidixadojalu.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/18987139939.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/kurewavowaferigusozinu.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/64743963150.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/49804065371.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/boxivorimasu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318ca458ea7---51298472239.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72680718751.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2a50cd---liborarokotezojeruzeta.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lazerasireronidifekevoxut.pdfIn PDF document text
    • http://gardatrans.com/content/Files/13835387882.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/29745085120.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/22103779358.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/75187963496.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/ketodakedoli.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/refaru.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/vozajafivoveto.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vagugajimupudoz.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/tijumevifigilirokupuvesa.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/fugamogozipeteta.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09146f201---tegumufofovanulixud.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e168d572d---sodifivamusu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/saxuvedopoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stick+battle+war+of+legions+mod+apkPDF 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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 11356 bytes
SHA-256: 7bd30dc338f2fb7ab18087a223460e97a62f790b18fbe89bf6307fe391577307
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 17000 bytes
SHA-256: 02bf1bf190961dad0e72b70ff8b958f175fb7361af7d659213d74d065effe95a