Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f1138fbccf1983…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 13:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77748581ae6fd3bc0e9f70fcd1cbb66c SHA-1: c545740b8a142b7834fb7b5e88f5f192f4ddc599 SHA-256: 10f1138fbccf1983acf26ca8c7f0bccf177a6ff04fc80a3c1436075899023c41
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to fraudulent sites. The presence of embedded JavaScript, identified by the PDF_JS heuristic, further supports this, suggesting it's used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3f68540850fb161df939a1179882877e/75292162349.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/lujebogisevazez.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/99p11jrem754k0ogh2uf7b03d9/54795183049.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3d6a1cf8---folowiwonofimasijakuvek.pdf
    • http://akicgiyim.com/userfiles/file/pewaji.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/16779771800.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8d3ede02---tawobilafopobifijutemaf.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/54cc3243116c3709eaa12261e058ea3e/watogemiwupumuwofaw.pdf
    • http://anaminfo.com/attachfile/file/makejesububejaxuj.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b884310b897---fetajisuzolugadexazilaxu.pdf
    • http://basaritarim.net/admin/editor_resim/file/45015256128.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1572b6ed5---296769214.pdf
    • http://zartmobilia.com/userfiles/file/20210616094735.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4d5ae0b2---galalowoxezajesudonifi.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/51304750133.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ca702313---84135358761.pdf
    • http://www.bluewhaleline.com/image/upload/File/74397738772.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/dejazitonipa.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454e68f0---fezelap.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cmd4u6c5rv85jgcnp4ieia7o4c/setegarorabikad.pdf
    • http://aylincinarli.com/fckfiles/file/5707969332.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1865c0a8d---juvenij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nice+day+messages+for+him
    • 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_off0000f548.bin
96a32fe80657e6d8cf8254242b3795fddf8a92747aca06dcc8c6095182b4dd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 18016 bytes
font_01_sfnt_off00012411.bin
3c006afd1132e510e4927a2ef7109b5518d5ba73e4e789686c47ec270a1fb6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10768 bytes
font_02_sfnt_off00013cac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 16792 bytes

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