Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49ba06183da46de…

MALICIOUS

PDF

75.1 KB Created: 2021-09-23 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e20a6d8de2e340cc97d3718cb568c38 SHA-1: 2c8c8e1d7a78e89807415b6c0069c67ad254adef SHA-256: b49ba06183da46de113428864d4c871ff59d74859007311c319c3c3b653ec289
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs suggests a broad redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chemtron-vostok.ru/media/file/wigopupawatujoxilef.pdf In PDF document text
    • http://galaxyjewel.cn/uploadfile/files/24980482.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/73523141148.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/sumade.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/48458169013.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/30489815046.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdc0ed720---fexidaladaso.pdfIn PDF document text
    • http://sergeybazarov.ru/file/72929464381.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1d5e511b96092bc16e03a1c0fd49b1ba/ligigokedakobolinekipu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/tezaxitiwiwaxofor.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/50176553317.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/29141288966.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbefc6c578---83473071016.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lakoxazanutegivotisukuziv.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/rivapipobijevilin.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/782bb37937d507cbeefb54b0d2e65936/posawinusonilutif.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/tibafuzibifufozi.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210831_184948.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/44315603829.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/laxakodejatexikemebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=area+of+cylinder+worksheetPDF 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_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 17080 bytes
SHA-256: d515f0a9872e4db9a36cf7bc95f3b0dfa549f69a0dc7a250f9e6b9759bc21118
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10844 bytes
SHA-256: bd249fbfa6f1702aec6690950139c812973f927aa84f5df4865dde4971df2eed
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1