Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95492fbbe7d68a1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-06 05:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7493e29796e93769c42e32ccf2ae97cc SHA-1: 6cdb8aa89c39ba3d7fbcb3d29eb21fc23ff24de8 SHA-256: c95492fbbe7d68a1187c230a8a8eb319f840415c0c62c1b01927349d54b4e3d6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://gaushalango.com/uploaded_files/userfiles/files/29405392568.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097336c88a5---97583070303.pdfIn PDF document text
    • http://airmon.hu/images/files/78593795068.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5be1c777bdd900cdc86e63db916f5598/zolavadixikifinez.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8ec00b9f---85579684954.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/91861215744.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wibubo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33fc82403---73715437043.pdfIn PDF document text
    • http://envigest.cz/upload/file/vuwatutiloduko.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098659b00f8f---20273955637.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/walapatujegavupexif.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/sisejewusadodowosi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bc00c4442b1d9ae2ae5ef7b9f34be500/dowile.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/53161855401.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mabepajunun.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/66478335048.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/43139841285.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/vajilazanijotun.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/67685868051.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3f1b8b5bff97863e37e02d6b31bd3eb3/nuvotonuwamosej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd1ee3b81---25041224130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=idle+bubbles+cannon+hackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000da19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDA19 18704 bytes
SHA-256: cfb1bebaa56dbf372651f5796151a567536a9c3f1850ddc22657dc5c11820697
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 17488 bytes
SHA-256: 96b3fc094d419b2206a9d74b2a3bfb736a7d8c954a060990f01785e2ba1344f9
font_03_sfnt_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 10460 bytes
SHA-256: 66091e42b597ee8b2c9603c37afa893054b129de0e50b1843b168b46ad58ad22

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