Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf033ca0ac177e…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 22:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6c114f2d7e9bc2ecb987e3782b5a291 SHA-1: bed95783dc4d0c5e8ae70b546ec238bd2dfce26d SHA-256: 7bdf033ca0ac177e98c4714bb3ba88e00cbad73eb1302ba5d615be4d38ad1b15
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on compromised CMS platforms and disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071c21addc52---74177536855.pdf
    • http://zhengfutz.com/v15/Upload/file/2021523057486628.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vptcs0cepkbs2t0anvfs8mshsi/mulusuvodexogiku.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070119e7607b---pagogejazumisawazo.pdf
    • http://icwest78.com/clients/67591/File/mekelem.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/80493544625.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b2ca1e46ebeec68b39a6590eda018e4e/mamiwoxujitinemafafel.pdf
    • http://namthangbasaltstone.com/uploads/image/files/ruwizamozisokek.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k7sq1qep8fc9akf0pat0fufetk/dedikofefoxumavir.pdf
    • http://atenngo.com/admin/sites/site/documents/defininav.pdf
    • http://artospace.com/pics/file/xonaxubavovojulisuxur.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ad871943---14655822349.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18d7f24a9---79394024374.pdf
    • http://okwecare.com/usr/userfiles/files/dekamogegamaxaluroposu.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0375b46b091662c10071f06e7eb24c86/zofitujetitimabaxudadix.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/kejebuwirij.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/46033639719.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b0a6ea8ad6f0c1e31e18656405e20dc0/belukonenawekixil.pdf
    • https://airflow-skateboards.com/upload/file/14610120851.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j1f3mau06jooriuu2omgruegu2/nasonojevimosidu.pdf
    • https://siroyensao.com/upload/files/26772632136.pdf
    • http://brilspa.ro/userfiles/file///fisakafimumet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=words+that+start+with+mis
    • 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_off000113e8.bin
70f7063951f825b358d5749da13cade8560ad4de73ed3b191ae4abbabca22a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 10308 bytes
font_01_sfnt_off00012b2f.bin
38414d6413725fd64334afdcaba03b8396dccef4e7a75c99e0638fd282a221ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 17304 bytes
font_02_sfnt_off00015871.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15871 16792 bytes