Malicious PDF — malware analysis report

Static analysis result for SHA-256 97483428e57af442…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 14:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c017b838cf1f38c33a9ae534c0d58eb9 SHA-1: 634dc1c5109f3a1f83582b993627308cd704ce1a SHA-256: 97483428e57af442c64429d5fc836a8b24096b87b80d3be64ff820dda35c829d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. The PDF was flagged as a link farm on disposable hosting and also points to compromised WordPress upload storage, indicating an attempt to distribute malicious content or phish users. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3771

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://backkwang.com/userData/board/file/rukabisopafoguwaxopowaja.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d650c2463---zenotixogobig.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ed2220b32e4f11ccd2df51534af41a1f/zexowajoxekivijeful.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/ketagisaboto.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fcfe99ed1bfe98a78d54f8eefcac0c0d/57828690020.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gamemiburusivu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c2595df02c43c66cfa03072617c39d88/fufulanomoxorimalug.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bnbdgk61rg2n1rkm3v6smhqk5o/godosetukewodafunafa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e4efcf4630e4d7492eaf6be7e6e22148/57549524071.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/75125671230.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c5319a7db7a31960d22b669874b1e7b4/13586184625.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/91714942747.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0579dacab3e995366fb0b841ff5cb443/gavulezovonatobelijoriji.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609711603cb83---rinuzasanesomenorilo.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2vk0q0j79rn2pqbflpu2o6ga6/kabenakuvorawusapewiv.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2duavibi04kp3mcph1isg9imq5/5058309327.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/21aef744d9a852993cf2767a5b23513b/pedozatam.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff3582f38---gugarakizunonirimafopuw.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079325e6a2df---fetomiteb.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/lenuvodotiluwifoli.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3f85cf34e2ad2e454a5bcc191d32e945/87238104619.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac59a7788---suzodujomasavetegonij.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b42707660d9---vapazegokupasilin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+reduce+the+size+of+pdf+in+mobilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 11100 bytes
SHA-256: 8755a001f82b5813d4a8088cc5bf9ba1fa8b0ac884a329039007c1a44b856c43
font_01_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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