Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7d8486a20a45c9…

MALICIOUS

PDF

94.6 KB Created: 2021-07-01 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c902ae6794342a207473e48f095d8ea SHA-1: 52f58a34ea6bae5d471c9730a2da9b059a96afb9 SHA-256: ff7d8486a20a45c9d831378d81290b7281ea83b8523cb56d815fdd89687a1ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download potentially malicious PDFs hosted on compromised WordPress sites and disposable domains. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=mapping+cardinalities+in+dbms+with+example
    • https://btcauction.vn/hinhanh/file/gosefipalik.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835fdbbee9---79751567881.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69d5c9287---sajupijelejol.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fca16e83fe9fec1a6f2d853f1edbba0e/67391663370.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/vomapus.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3931703a7---gakigowu.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/501417a1c5c7f98190bdbe27da71d107/jaxafakonogexapeneviragaz.pdf
    • https://bnbcostaverde.it/userfiles/file/zitepevovepog.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/sakivami.pdf
    • http://ritadas.in/userfiles/file/14114825985.pdf
    • http://www.findvoters.com/userfiles/file/bugafenozufi.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74028a666d5edfe6cfdc6e2fcae000ad/77680248783.pdf
    • http://momsystem.ru/public/file/pikedube.pdf
    • http://reguitti-engineering.it/userfiles/files/kabupikexomezakideb.pdf
    • https://zlatartopalovic.rs//files/413074796.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bb8406affc66f048c87b1233f6aca091/35858535952.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8a786f8dba7a328e8515aa4743fa0cb9/50420803517.pdf
    • http://aylincinarli.com/fckfiles/file/24794117204.pdf
    • http://barcabianca.eu/upload/file/liworafujogifibivevexawo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fgbprk4qgnhjgn42ajrk6t4te6/falig.pdf
    • http://acecaalcoy.com/userfiles/file/tupekefudumomoximapax.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f485bc21d---razuravi.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_off000110e0.bin
b8f026baf1b8aeaffbc0fab6a526a6b5bf2c79be70b9934908637a741b985edf
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16556 bytes
font_01_sfnt_off00013bba.bin
a3f3c46c33221494715a48182bd2ddef6e5d39a668cf1383bd307422da0badbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 11164 bytes
font_02_sfnt_off00015547.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15547 16792 bytes