Malicious PDF — malware analysis report

Static analysis result for SHA-256 9054ee45cee1f941…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 12:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 282dd2a1fbc7b676f8b2245d0f4b08f4 SHA-1: 841aa9b7bd3419cd1f309df7598b241aa74be4d0 SHA-256: 9054ee45cee1f94192ddbb08840535590d18a9d9266f78aff7fb28ca38b4b829
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=google+keep+notes+app+download
    • http://nano-vip.com/ckfinder/userfiles/files/melokapezeri.pdf
    • https://31app.com/userfiles/file/dokatosirogi.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/ziwazasow.pdf
    • http://nicenpos.com/userData/board/file/vasuzoxabupuwigovukegu.pdf
    • http://bishnutoursandtravels.in/userfiles/file/zoxodakibeba.pdf
    • http://a-xian-coat.com/uploads/files/202109041105286554.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/ketojigemo.pdf
    • http://deccanquest.com/konadnew/userfiles/file/vuxafomafu.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b22b6572bb17041dc7924bcbc77b5b3b/kukavolaxidawewus.pdf
    • http://vanharteyoga.nl/uploads/files/70208589696.pdf
    • https://laplacedesstores.com/upload/file/xavibiwutulixiwuko.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc6b7dbc---sozezumowiworafatigo.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ad762932---95461203895.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142292fceae3---dosarelob.pdf
    • http://euromarkcreations.com/new/fck_img/file/32920063566.pdf
    • http://reflita.lt/uploads/files/nijavilazulowumes.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/gajonivavuxusimugeniz.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/soxuzununasenifed.pdf
    • https://bor-diing.com/upload/files/toxopajoze.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/93790001044.pdf
    • http://kesherisrael.com/uploadEditor/files/muwujovaluwubesese.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399bd5944a2---69144940192.pdf
    • https://istocdukkan.com/userfiles/files/46055980061.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/80919084407.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0b.bin
5aae42dce2ab2c3681decdd6ba8807905c83dad64c81357d3d82d5f5cd6ef1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 19064 bytes
font_01_sfnt_off0000fcc8.bin
e422d1386e67a20196b86e6fae1075d94de1c30a9378a07cddba1f51898882ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 10592 bytes
font_02_sfnt_off00011509.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes