Malicious PDF — malware analysis report

Static analysis result for SHA-256 58477844216dddec…

MALICIOUS

PDF

89.3 KB Created: 2021-09-24 20:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83b5cdf2975699e72e2589a1eb160b04 SHA-1: e3f448f26a6763d7ae0f9fbf5e6911e8ec117da2 SHA-256: 58477844216dddec087dec9bbee9bdd04e6c47e9ac11156a1a6fb4d12e38bc93
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0cc262d0c9c9142438447419902b61e4/wovadeturebemawifatog.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/27528283978.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26012063757.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/demumagol.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/sulule.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a8a54721---31652592871.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pofunig.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/talewilepakaka.pdfIn PDF document text
    • http://knauto.com/upload/file///9753269584.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/fetapuve.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/098925246108be20bfa11e6ae95becf1/9091700106.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/melujizozeriv.pdfIn PDF document text
    • https://harmony.im/userfiles/file/lofurokaxijiralefukofa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c85f3d7117---pafedenewizewumolo.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/duwexuvefebeweges.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/93938088386.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13e2327de---72504454645.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/82143081694.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xiziworazavofidimeliku.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c6897cb73.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/84378067518.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kosofunazura.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/svjfmludg6li7fkvr9kifpmm5o/xototitanewodubezi.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/24228910838.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33b2593ad---wovava.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/nugepalilovomakekulilit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nms+ginecologia+y+obstetricia+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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 23404 bytes
SHA-256: 45055c7f85e59a15c27bc70f57aca40fbe01ab0b2bee7eb68c12a6b18146a55a
font_01_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 11196 bytes
SHA-256: 46c1d11a951ddd4be6ee76d55c1c0f33d359af417c9b9066a93ddabca7089c72
font_02_sfnt_off00013dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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