Malicious PDF — malware analysis report

Static analysis result for SHA-256 37151cb3363de963…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 00:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6c4cfdbcd91d3089c00191d4e5582de SHA-1: 060b2ee576d7e00f9dbe1c5195744331c008a4ae SHA-256: 37151cb3363de963e29ccb551789585829fd36b3c020582c0296cb71ee3f7102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is obfuscated, and while no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4a2b270e---23458342899.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/zanapevepuralotorizob.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/debokupofikijanagoden.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380149b7dd8---70163834194.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/xebixariwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb7737484---bevanabanal.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c70ee549c---2177251873.pdfIn PDF document text
    • http://modern-pro.ru/files/file/39525387938.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wivefaxade.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/44059798504.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/90140329278.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/65379876715.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/56171900494.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/zabamowisodugas.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/dotimezorabefon.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/sakij.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/81286072743.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xupobefajokazajon.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24215886541.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/sujewomerup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+secrets+of+my+life+caitlyn+jenner+pdf+free+downloadPDF link annotation
    • https://b2cdemo.tickets.com/content/files/22989426525.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 11176 bytes
SHA-256: 111e4471170a5083872b28c784a1a026d3b38f2bcc554933348961c5ff851687
font_01_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 18760 bytes
SHA-256: e097293b404ba9218be19d999fcba3ee0572e48e4233ac6eb24688fe21a1a6e6
font_02_sfnt_off00013e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1