Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a4ae81bd095511…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 08:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8ca54dca66cc9442a0ad066f66adb32b SHA-1: d9ec4f853ea42997473869fffec5d2b01cb1a64d SHA-256: c6a4ae81bd095511f619261816fcf0beef90956a91e8709103454b3bbd521a16
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mcutech.net/files/benuvidow.pdf In PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/jesogazarug.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/livovem.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4bbe4ad6---79737310519.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/23811751704.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/16858360824.pdfIn PDF document text
    • https://europartner2.pl/uploads/xidubidojenizezodex.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133414e57a91---2304135208.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/68993957526.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rirefovaxunalajigewatapul.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/41866022957.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/19125189177.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/pakes.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/xutavugiridifuxe.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/515821ab9ad6970e07aef5632404ea0d.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/meramifanarasogamulapa.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/66494570078.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907054540.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fc37efa---dimarex.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fonanisajuvopajisidoj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpmembkhi5t53poo4d55ra7ig7/demavexefijusasa.pdfIn PDF document text
    • https://mbbs.hr/files/detilinabatopovef.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/96190092873.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/tebixas.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/51874428985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tonos+para+whatsapp+descargarPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 18840 bytes
SHA-256: 01665911584b1767109bf66204e7eed5e57616c51ac80fbc625fd5251b915f25
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 10704 bytes
SHA-256: 7d55cbeb7e45be8e8159adaea03ae7c63d2383e230a1e9dd6c061293aea276b1

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