Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aab137fd15b1a67…

MALICIOUS

PDF

93.0 KB Created: 2021-08-10 08:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce590cc0ae3b75e46d5e01a32eff4e79 SHA-1: d233e920c6766f56ce0d0fe5916f38464661cb17 SHA-256: 7aab137fd15b1a6753bd81605e240012d0014a845b395e7d1163cfc1f0d6eeb2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDFs hosted on compromised WordPress sites and disposable domains. This behavior is characteristic of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55168ac1e9---zapidadutasufuguzotekaxi.pdf In PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/bosunekibuzorugozu.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/97364972439.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/misonegude.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kigiwovavisopoziw.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d6858bac---defelapakug.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/xewebugeduwo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s47vd95osjv1ppfnqeusi8atit/33484692926.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/34877571093.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/20189807643.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbe2ed5a1---mamajenotaxed.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bbbec9d8c---visolawobufilerogitinubep.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/92663315194.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/13872465280.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b087820---sixufosepogatalejigosit.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62d711d1a---81968853323.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/sukaxog.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/lixege.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/komidoj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f1910308---vaxezabozovubox.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29a8a324e---ginasalogumum.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5337581c374062d80ec43b4a28cf387e/80985353121.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550ff7e889020512ac50442e180668e2/wafugonilaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+9+in+24+hour+timePDF 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_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10784 bytes
SHA-256: 9c757f32a3171584de2fae7601c6551d5a7005964966724aefde10ad0fa99ad0
font_01_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 17696 bytes
SHA-256: fdda4a3bce5abc20f49f7208f1cad14c1e8d041bf3862b803d2176789bf3218d
font_02_sfnt_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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