Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf19d99bcb3750…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 23:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d37549ca40e4fa677906f6ce14df08 SHA-1: 9c28863a841a72c68ea870275dfd179ebac8b8fa SHA-256: 5fcf19d99bcb3750406abc2c1d7c857c9a311493674db742fae3e6d2abb00359
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised or malicious domains. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a deliberate attempt to obscure the final malicious destination through a series of redirects and potentially compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dom4m.by/userfiles/files/71304264353.pdf
    • http://happy-land.hu/editor_up/73660167027.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/59175089427.pdf
    • http://hotelalbicia.com/userfiles/file/75477960000.pdf
    • http://studiobonvino.com/userfiles/files/83861577727.pdf
    • https://polaria.cz/images/file/12754990393.pdf
    • https://smartstone.ca/userfiles/files/letikel.pdf
    • http://accessprecision.com/userfiles/file/87642094041.pdf
    • http://www.gamylai.vn/uploads/files/ronevoxutuvasagabutuda.pdf
    • http://sportgalaktik.sk/userfiles/file/xezovaremo.pdf
    • http://immobiliareborghi.com/userfiles/files/kowuwazu.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdf
    • http://bbfederico2.net/userfiles/file/57739489959.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613450801ba21---35551080711.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bf393ff70d0411b60a0043c396e9f5a4/mazonigotafosawin.pdf
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdf
    • https://edarky.net/data/file/nojog.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/29948485234.pdf
    • https://8cj2aja7-8mxb.com/contents/files/totedarudodokufuxazarasap.pdf
    • http://smflow.in/admin/uploads/file/rimozo.pdf
    • https://dcoderesearch.com/uploads/1155650815.pdf
    • http://skogsformedling.se/bilder_umeny/File/1347000584.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310bb148f1d---37595954575.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862f9b789c---88021885536.pdf
    • http://placidlakes.com/larpm/uploads/file/79738754603.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=john+wick+chapter+4+download
    • 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_off0000c07a.bin
a09ceb04459bf86f43b66f31fb6aca362bec33ea83fbaa69c169eb27555ee8f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 17824 bytes
font_01_sfnt_off0000ee70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16792 bytes
font_02_sfnt_off00010687.bin
a103efee5c6013beca44fc979026ed72f528e1a634cd9b0dd254ec220478de2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10692 bytes