Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bef69f8142a7f29…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72799e20a124d9e0e23017f0998af7ad SHA-1: ba7f6922f726006e26afa15c74070f2e70ac070e SHA-256: 9bef69f8142a7f293612e3f359e01c131032143e7c6e70ef20a6a85ab6d67fb9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df5f4cb6b---zipibonojubulisadowa.pdf
    • http://kulturazebrak.cz/userfiles/pefotijitegokimawin.pdf
    • https://ikuseikyokai.jp/ckmedia//files/laporepu.pdf
    • http://ministerium.pt/files/33647392226.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4d87e55a---fexagomakuropiginabezeg.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd63f50da9---kexawuwigusosiz.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f620d27fee---38125912204.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/53377854076.pdf
    • http://funperm.ru/content/file/rovuru.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f46de3e1f---17331270297.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0b6d8c23bc94082efc8057a4938137b4/11364021497.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8a1d45ae5e22395dcccb8c3a7129c549/22489065694.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a92049d8185a8ff2d6e7e7c9b1186147/jinulezefezarafewotuz.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c93njfkgv5v8miqgl4934a4l5b/sijamafipepasebip.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e71e2b0c11c892d78cb0965a12f4dfb8/gusibejajimale.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j1ssrluak529ohjdujl83aidoe/90905352048.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e92e514df---titebum.pdf
    • http://gemculture.com/userfiles/file/leteranuwokido.pdf
    • https://cplastik.cz/data/cms/file/xewonukikasepezotuwexenun.pdf
    • http://automsystem.com/UploadFile/file/20210516235935902.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdf
    • http://france-ex.com/images/blog//file/nakogawogirab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=st+augustine+canterbury
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
font_01_sfnt_off00010b27.bin
04e2f08207ede26b143db4bfeb8f1a5f336431f232a968a05b77bd53ca5248f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10668 bytes
font_02_sfnt_off000123c1.bin
e4db99dd348aaeaa256a0602220ac4afdf2730563cb7d8c2f15325fce70f4791
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 18784 bytes