Malicious PDF — malware analysis report

Static analysis result for SHA-256 851e0f2f1d53274b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 07:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d7349f7792be26ba424e496b9b3b285 SHA-1: 56b53a5e21985db71d60691911855fbe64038df4 SHA-256: 851e0f2f1d53274b9c2cfc623549631b94f4dbe0eab3ff7cdb20ae5197d9b156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://dammesliepas.lv/ckfinder/userfiles/files/bitogokopinesodezig.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ooe1s4gdlkiqjjk6s4bg6cjke2/75759798468.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/68985741321.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulevofugalanekuxiro.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/xogutopaxope.pdfIn PDF document text
    • http://friulanapanini.com/images/file/luwadavi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19827270---54581236251.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109060717137701.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/dukagaluwabowexugowubo.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/befomasakufefosolefokobim.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/dinuradejunotaxilenif.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/zomitokumudodedo.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/bekolekibal.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fevotiz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3ef8edd4898229d3c9a6b130e3b779ce/ralopufigumup.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/57435452700.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/14287904935.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903195952.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/75381287341.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/84298853640.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/54705782100.pdfIn PDF document text
    • http://scsychem.com/upload/files/dexire.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/76128859684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+cheat+gunship+battlePDF 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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 11020 bytes
SHA-256: 09f2825ebebd68fc6719d74423088a864ad7cea1353989581105fd65ea743d74
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 20032 bytes
SHA-256: 4aaec0cff2db8ff689cc2a3195d8aac857452c173ad806173ee8513b17067f4f
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1