Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66e2ab7f1695902…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 04:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ba4c3fa1606bbbc88208d81d46e3390 SHA-1: b93cf3fd59e58d02dd85b9db143ab083ab87e723 SHA-256: a66e2ab7f169590241003bdc4c9accac1d1875f3136df0886b9c11022e64c803
104 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 WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on potentially untrustworthy hosting supports this assessment. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be social engineering through link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://osakadentalcare.com/contents//files/3168021294.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9a3ba340f---1867893725.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f0421aed646ace5cfc963ea4da3d98c/wejed.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/dapatuzimatu.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72060230419.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210820_045513.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210722105345.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/i5funu0veiq3pmn3e5u9ood0aj/zunetasilegumuxolamusurow.pdfIn PDF document text
    • http://zaiger.ru/img/file/xejobiseparimebasubavu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/satimida.pdfIn PDF document text
    • http://maihome.hu/admin1/file/73992479370.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c2f722608---jotopefofubeg.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/pufutewudemi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce556d7df---guwajapumanovi.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210512210309002.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202193838217437.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/sodudizedofa.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96151061270.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8a692393---madufanawubexevumejaf.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c071122935---73398902963.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161076a200db67---37517758479.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8efb038cac407faab318840d95461138/guzexizukijuzano.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/voduxugamul.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/firutaronanugom.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/93945110972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=uscis+form+g+1145+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 17352 bytes
SHA-256: 73c023a8ea06102f375b6a5475bbea0948d5229673eec7ebc4707c5008b653ff
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10692 bytes
SHA-256: fdd364b4b01cdaeabd2fe026ee334862801e9000cde7f6a69938fb803318baef
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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