Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b0891082c2565f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 14:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e018d51016616fa56c959ad86a69f8c6 SHA-1: f01ff4c8463c85a4a4e3911bf7b90aa1d33779fa SHA-256: d0b0891082c2565ffa721221aa50dd9edc14d4474876fbbac28ce83548a6d883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crysiq.ru/uplcv?utm_term=geometry+dash+full+ver+free+download
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/22808092259.pdf
    • https://tessuno.com/upload/files/613ebcd1d7263.pdf
    • https://nhomphuongnam.com/upload/files/40545315632.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141804cbef2a---ripovumupesaragokame.pdf
    • http://ttlh.vn/storage/ckfinder/files/16916266629.pdf
    • http://bjsddesign.com/filespath/files/20210914072315.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152b0d3472f7---66593703070.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161462f0fab710---46906457903.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/vetoze.pdf
    • http://togclick.com/media/userFckfiles/file/vukesuba.pdf
    • https://rinducm1.com/contents/files/lazelesibupapodofezumome.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/13193616410.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/70418791423.pdf
    • http://bestbelly.org/content/files/files/wozigagareta.pdf
    • http://giaexploring.it/userfiles/files/tixivujuwozofopukivawuwo.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/dowudapuxujez.pdf
    • http://forma8.kz/ckfinder/userfiles/files/zuvulozopamowukopenuxula.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/goturujojebokogow.pdf
    • https://erdenet.mn/userfiles/file/9447656603.pdf
    • http://designbyjoseph.com/uploads/File/pawumizojusuziw.pdf
    • http://wu-pao.com/upfiles/editor/files/supeleriwilo.pdf
    • https://eijo.in/ckfinder/userfiles/files/bekisobizisiret.pdf
    • http://jandenzobv.com/image_uploads/file/pifuzuvarutaxixanikoj.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/fasuvol.pdf
    • http://seattledesis.com/fckeditor/file/kemajadabasefer.pdf
    • http://pospatrans.cz/UserFiles/File/vutifezukipaposuruwozez.pdf
    • https://heart-calligraphy.com/uploads/files/202109062302088966.pdf
    • 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_off0000b77b.bin
12d67ae8224bb0d3ac0212ffab67996d8dce07e3d89af03eb3ac6e32cbf36990
pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 10932 bytes
font_01_sfnt_off0000d0c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 16792 bytes
font_02_sfnt_off0000e8d9.bin
f65d77d26fa7bc56dbb9a895c9753e0e25a669c6b93d218bf2d0ef3aaf1a7591
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 17536 bytes