Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d768b9a31bd360…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 11:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd4a9aa9674d141aff460e5e869ee807 SHA-1: 0ca107e7bac4fd24be1c22e497785741ee60447e SHA-256: 37d768b9a31bd3600d3ef56e872ae3f4fd065c16482208bb62160ff4f386c90b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond acting as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://emilline.dk/ckfinder/userfiles/files/mubalekerowiziguronixuv.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e5d60ecc00726ce157bb126c37ef1104/siliwosoramedot.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/zarusubomow.pdfIn PDF document text
    • https://aashianarealty.com/file/nisarem.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1hvmt1ltshpgbkpu10mtbeusuj/murijijenagen.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/k8uiv7cg137cb342eposqst812/nevam.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/pedegegatizudir.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tatelumugax.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd19af3ba42---raxisiruw.pdfIn PDF document text
    • http://ailizia.com/userfiles/83454697158.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/77214721039.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sekuvaw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165302c0a7f---badomotoxogoj.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202108310909042208.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/51912535739.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/99191949911.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607729b546b80---45729806358.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/pegotepozotibebura.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea9bd44b2---95252739518.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/zugabakelafawamamunifo.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_010753.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609427ccc7152---85005767605.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tomimufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=folha+pontilhada+a5+pdfPDF 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_off0000c4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 20892 bytes
SHA-256: f3da3ed1d58393ed46950e9551a6e934ef652a6e8e3ac561ce038d2230f19cd3
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10308 bytes
SHA-256: a745e61299f9126cbcc56d9a431f091682e431505b27c94d287b7735fd232574

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