Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebfcd408b59cec8…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 09:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 709b7eb795e8c2295ab51bf5065541d2 SHA-1: 56514059d7cae389ff78a9d1777508cb2a1fdad0 SHA-256: 8ebfcd408b59cec8672fbf968a367dcf7504732265c01fb2a6131cd7da4f3b3b
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple compromised CMS upload links further supports a malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://classicalgardenfountains.com/uplds/file/60881583613.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210618003509841307304.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b601e4514a9---vipatomakulijixalixudikus.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8187789029.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kq3mkjg7gpb4q92p6vdmtm2jrv/topomorironasane.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/11632000843.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bubove.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0cc8df09---83849086395.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/19992616740.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/55809502253.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/mukijuvunow.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/mupesidejogitonetit.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/18668001231.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m57hkeiocfom1h2dcog0uk088i/zawor.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/vukupimigafobugelikike.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4825b72d2---66090020789.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xivakapusefetagemiz.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/22876837144.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pufex.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3baeccf81---23382462993.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/40403499830.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4c032922bfabe425dcb4166176c3fe7b/15174090625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=babinet+compensator+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdc37ef18---xutag.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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 10928 bytes
SHA-256: fbd81148b10400a1cae18a6476d721ba46d3d4b04c10f24d3f1e0fde14d67930
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 18436 bytes
SHA-256: b29934f782febf3bba94b55312b2589f6c1a633c15b582506efb0fda7f0516e9
font_02_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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