Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03754db25e52e15…

MALICIOUS

PDF

109.0 KB Created: 2021-06-26 21:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c0cad2ad890fff2924c7679eec478ca SHA-1: 72ac4ae69833fba056a427d623a206ad6b4f97d7 SHA-256: b03754db25e52e150691bf6c051021b954bc8dd9fc1c46cccbbe131e4bc06e14
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a 'Clipboard command execution lure', indicating it instructs the user to copy and paste content into a shell. This is a common technique to bypass security controls and execute malicious commands, likely to download and run a secondary payload. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://thedewakohchang.com/image/upload/File/3516775665.pdf
    • http://poiskvod.ru/images/file/joworevuzewugojix.pdf
    • http://acpiindia.com/userfiles/file/89159755409.pdf
    • https://angkagenap.com/contents//files/vasisexa.pdf
    • https://kristinanamaste.eu/files/menikejodesuxomakimaga.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/24534624064.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xilonamilefomefi.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/wuvolijinajivu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859673df1c8---fazemesej.pdf
    • http://atsrealtyvietnam.com/upload/files/93206969757.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3d653ab5---jinazanezewitul.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160720796d33d4---21611278977.pdf
    • https://srmhospitalities.com/images/bulk_images/files/niluto.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607671151fd76---72604985319.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9cacdb3af853d7453bdd00787fe00ff/52648630533.pdf
    • https://alshaabcoop.com/userfiles/file/roxebuzuxeta.pdf
    • http://inlygiaylynhua.com/upload/files/77637396783.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821d2d47761---duwigofeliz.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8563e2b31ced498e57580296658256ca/dumemajun.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f77f6c44eff4e12e138f6929c0e4bbbd/43245157497.pdf
    • http://capital96.com/userfiles/file/gafotatamozajazopuvan.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/1i82pjn1mi1updao0slcmh7m8p/zunadopamugixabovatok.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jusapujawewitetewinesov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=transferring+human+consciousness
    • 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_off00014715.bin
8da06a13f8dc5a724066edff5f8dcbf2e02485fb31fa290788d5a1b6a3c02788
pdf-font-stream PDF embedded font (sfnt) at offset 0x14715 10704 bytes
font_01_sfnt_off00015f73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F73 16792 bytes
font_02_sfnt_off00017785.bin
43d97dd89061acfd348eff0ad5dd85c97374b4a0b9526e66f8df14650d263ee4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17785 18760 bytes