Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf90fd5eefe346ce…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 22:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7885cba6a146fb758dd8f49be9f39bd8 SHA-1: d8394d60ebc4f7bdf7921362c9221567cf2685cd SHA-256: cf90fd5eefe346ce524035885d283f3fbc81b34b31b18684a1ebbb5df521281e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of these links and heuristic firings points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075415d2c63e---21916940972.pdf
    • http://aisef.org/uploads/userfiles/file/file/devir.pdf
    • http://moscowprice.com/content/xuploadimages/file/kalijegud.pdf
    • http://preserveproperties.com/userfiles/files/mexitaviwakabaxawaji.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705e0bb7e95---13853570099.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/92815244558.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b624077c54---21766171492.pdf
    • https://cicadit.ro/UserFiles/file/48694811963.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/brutmcucdh78luokioila1bofj/mopivelafozamux.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/sigelujivutu.pdf
    • https://eqonetech.com/upload/userfiles/files/86018559037.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8bbbe2aba3f41f5bc23848ce4b70018/fibilipowudolibefe.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/36562410083.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4c9e4a8b---51117868630.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d75561dd36e2d243b081de99d55a196e/11709258065.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/h960n2s23t2fsmgpclvkvo09et/webutok.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609876101e7f8---diburajabomapox.pdf
    • http://fullx.net/files/wakokifigopo.pdf
    • https://areicon.com/images/file/26237599401.pdf
    • https://dianthusindustrial.com/resimler/files/doriwidavamebutobavu.pdf
    • http://baigeleather.com/userfiles/file/39853025598.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db025e2084a---78890491556.pdf
    • http://afro-safari.com/upload/files/34266639635.pdf
    • http://eyupsifalibitkiler.com/resimler/files/zoduxe.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8dfba74d---vitumovomudojomamolufala.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=owners+manuals+for+cars+free
    • 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_off0000e5eb.bin
40df6f867716dcab11b806898e4a8aae774781b081fadf6e32cc4c2721114be2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 10516 bytes
font_01_sfnt_off0000fdf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16792 bytes
font_02_sfnt_off0001160a.bin
8a9e370c99fc72b917586058199d2af571d5219db3efa0dd5376d7d5c4b7bcf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 17596 bytes