Malicious PDF — malware analysis report

Static analysis result for SHA-256 b462ae8d8b689b2d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 00:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee38f89444f0a2cb7ca69055e93d353d SHA-1: 7099e8bf50f91062f8c13c3ea20dcd93742e6bf6 SHA-256: b462ae8d8b689b2d5693acdef28853ec4ee99bf7795a9d44b4b3127d5c367f67
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://saleskerala.com/ckfinder/userfiles/files/52413949695.pdf In PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/14810917583.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a682a8e89874753ecec0b95e411ab657/gasojigivumowebezojix.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/sudexozevoliz.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5140e1fcc5f7cf73ca10dacddf1aa201/kareb.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/sobunebixawoxus.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexexod.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/32907471857.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/68474300545.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109050756338216.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12706907436.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/gowales.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/830df4adc9b6e8aa67860c80b177a3e3/39505327083.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tosuwov.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/93559407126.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/dotefaterejif.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/renexiwapusukin.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/58684889711.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/laxazonuzasorikazo.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/66158292671.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/22836220968.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c566c7ff84b6a04bbf84b5397af05c59/zatowasevefimur.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/9920576218.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d086676c7---pibal.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/aafefa5493d6654a8a740be6ff172f5a/43128822427.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wabikazepipitevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nord+vs+s10+plusPDF 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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 18412 bytes
SHA-256: 9a75fabc33bc5a8a545051d12efd3052c82bbe3d43c2abe280deef3a5b75caf6
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 10112 bytes
SHA-256: 36e48ef72746a1a35219cb5c78fa1ca5f38bc6d4511f13c5657b97e06dc12236
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1