Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4221b289f69152e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 03:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73894a66ec349b0a846d7dfbb42c60b5 SHA-1: 15050cf3f25a0219491b188789256d942ff4da05 SHA-256: d4221b289f69152e02f33ccacaf78949b2edb5a5143a71ccefcf621265351b65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091378724029---65680723627.pdf
    • http://canigrup.com/userfiles/file/leperidopur.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb78c0757a---baxigifuxurif.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/31b0fb991ffef2cce0e1b273a24fa88f/81518246133.pdf
    • http://mnogonomerov.ru/uploads/file/45641773407.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c5b6168f---29785799204.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b247309b9---wijivegef.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2b47256c40048521bfa54bb75a6527a1/kasagavam.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086932c3e591---12894143372.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/18ika5mcaelv9f50kvdmu1ms70/1430357962.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/76388891474.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2588c6231a---gegag.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e5cdb7a229988c7d90c2da78ed4dc35b/99080381411.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16078207a77d70---romupibuxo.pdf
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/xomilubibelakipesibe.pdf
    • http://ahxxzx.com/userfiles/202105/file/lobolelakikit.pdf
    • http://absolutelyneon.com/userfiles/file/5933334288.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c004e7dd---67357787985.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090118551894---fivumilu.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90502e4859---42323210216.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bee93174da8---48960890166.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/512485edb404c0966d7f9cf9ba587c94/zaloxedulonomowenenuzov.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dda3da1a3bc35922d9095b374aabd2a3/niruzod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=my+heart+aches+sometimes
    • 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_off0000ef30.bin
76192de26f9a2777584836492b0affaeaf030ac38423d64cff25bd550a9a4236
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10452 bytes
font_01_sfnt_off000106fe.bin
5ca9952b0eac4276acf4bd4a5f64a4acbcbb51845ed9ff38ce3057473d0912b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 16864 bytes
font_02_sfnt_off00013305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 16792 bytes