Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c8706e0fcee2cc…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 04:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c662c1be6ab852bf4132fd9bd8d2ab5 SHA-1: 8778efcc19ab6cd656e5aa6801f728dcbcba1a65 SHA-256: 43c8706e0fcee2cc59ad033ea6a08fca54ea7163402dbd44c63391178bf61842
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=escape+room+movie+free PDF link annotation
    • https://yarpaket.ru/userfiles/file/17975372433.pdfIn PDF document text
    • http://skolky.info/foto/images/file/21244938592.pdfIn PDF document text
    • http://aven.su/userfiles/file/88019419773.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/kijokasigapalubokipev.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/12333559197.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/lulemafifidudexod.pdfIn PDF document text
    • http://8njl.com/userfiles/files/vadopiwake.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/tepanamad.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d10d4c3---vawiwaselol.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/difad.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/51397173101.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/23419592014.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6afc7f352---5984099306.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/17253714159.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/bakefolijuxuguzugelutof.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/8612861511.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea628e8d2f---57434332007.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/5827847401.pdfIn PDF document text
    • http://teraval.cz/res/file/13510366671.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/18651640841.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/86148794871.pdfIn PDF document text
    • http://etnorom.hu/pictures/fukelitajejatasolilaked.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/74571272639.pdfIn PDF document text
    • https://123natura.com/stockages/files/riwajuxokit.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/gusirivirububoduzupovot.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 20696 bytes
SHA-256: 02d698ee35d9b888118b78458ef26a14eb73eca0ee52ea07800e008eb23b140f
font_01_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F28 10444 bytes
SHA-256: 53b9bd4895c8646cc7a5266ad4aa5977220af4bec1341d4ece7e0ff94a7f4404