Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04cb8be50d1a4cb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 00:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef492442d506f13490972afe1dd344d8 SHA-1: e8d687c783c6cba6ef0fdcbb6093f0e51c3bfb04 SHA-256: b04cb8be50d1a4cbd9a62cc5c6f9b47a20d24abb34d3e0ed7dc205aa26f91ff3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a lure to download further malicious content, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809e60e92eb---wojujikoluxopivor.pdf In PDF document text
    • http://wami.cc/data/files/rubibinasiso.pdfIn PDF document text
    • http://fxlcd.com/upload/file/36275101645.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9000bac6a7---79961014271.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d6c2e9e0---goluworebanorewir.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/gazisovezepobokov.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112214d77f6a---wijafekifixaradon.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/62327387531.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/79716045540.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b0eb66d2---77844411257.pdfIn PDF document text
    • http://ktcz.eu/files/files/82612660160.pdfIn PDF document text
    • http://odumakus.com/uploads/files/96951384831.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/jotisekakixapelibufut.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/22511402075.pdfIn PDF document text
    • https://ivanamihic.com//files/vufilanavevaxitanebev.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j2n4coorf1t7812klfaa1j1su7/21945726536.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/77152846479.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/6140571969.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1ac93cfa---duwuva.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/felukopo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe381d10a0f---16095969819.pdfIn PDF document text
    • https://aksusu.com/upload/files/64777073373.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95694e2b7---vopejagagazumizito.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e9b294f9---71702973342.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a2c7a55f---44202699088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=selective+color+onlinePDF 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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 18868 bytes
SHA-256: 547b5ee842a5d22b718681976ea0c07315f97ad96dff9d72334683febca7fcf2
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 10036 bytes
SHA-256: b191eb916412ee1711599b4775cbfc5e8ce6ed1969f069ab10ccf04eeeada835
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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