Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cb1d35828f099c…

MALICIOUS

PDF

92.9 KB Created: 2021-07-06 09:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e5a9d85f6090b00164c83640876c77a5 SHA-1: 9187004902de837068fd301066c951987e163544 SHA-256: e9cb1d35828f099c618f5a03b0b4722d409e7b874c5fbafa3875d9846d930e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b23328b7---vubajamaru.pdf In PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/34682918038.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/62895955586.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dae23407---pezevubarevudubitefi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zufasigibagolin.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/xipuwunixexaganupesab.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ae5c1a17d339d0109c272be1e9d3a2a8/12462244681.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/mumeliwubib.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d86ac736---20287533906.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/24582825007.pdfIn PDF document text
    • http://allycatering.com/userfiles/52723683324.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeddc54c1---29152591081.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9kt6c1krca1e3e9lddkn3sl4h7/65248465810.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8i164i9dq4kvklm59bkmlh6c29/jenawetemix.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/darikufana.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/69901386004.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/25076640226.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hqjedp54ja1kbkrpdod5tfsos1/bamimasi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i79ieasraouhclkt7u9t61gk31/raxugagawojug.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb613c68edd62eb70b5d83aee69967df/41398317192.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160812ee850892---wibusugoxiza.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/20363292387.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/metojiguregaturovipave.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/15270049672.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160895c2696953---3317612675.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/06f48acaec4a1390cb1f61a20b70c93f/siwalugubutemabar.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/97369487179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=easy+bake+ultimate+oven+instructionsPDF 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
font_00_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10884 bytes
SHA-256: 4e96613a4fbaf9d19d0c3393cc4dda1f501422c6601dd1a45c3b0dbcd2fc23bf
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 17456 bytes
SHA-256: 08ae9ea6a4b8a7d71a29c11c2cf0ecb7806ddbd5615d54dcd9c65435b9f0d122
font_02_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00014d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1