Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed56874e9994183…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 18:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50b963005baa9e096e42f7eb603ceacf SHA-1: f15050285e92666e8a4ea9eb617e3880dd24fd8a SHA-256: 1ed56874e99941830fc90db294ec87d898c98e0e5bfed61236408f074b70fec9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy/paste content into a shell, a common technique for executing malicious commands. Several URLs point to compromised WordPress sites and other domains hosting PDF files, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liriven.pdf In PDF document text
    • https://ip-pharma.net/data/files/vironawu.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/xifem.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///lipesezopowewuluwiz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231b360e86---56117484390.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/sajajusimozudenivijunaxep.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210731_C11D00F554F57E58.pdfIn PDF document text
    • http://unsersohn.ch/images/file/74023040525.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bofefiwagowela.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/434349f5f87e52b2b8b6d1502d9bc37f/10213730915.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac996bbbc---35544665634.pdfIn PDF document text
    • https://actorconseil.com/files/file/ketolewiraparavutufamoz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4177b20f---90767184815.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a74735f4189---befes.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4ce14629b---77670270954.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/vefatexomigom.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/85513932905.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/69347618497.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/ripavetajufopiwu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vbhn4c3mbr9p1atnav63rt6t72/74050020359.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/bikusejejuxuwesek.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ihu1fdes06pcvduqr56vm9c2v/84270895366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=primopdf+para+macPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 10236 bytes
SHA-256: 5691f2ef02e34011d9f0f85b6bcdf4a9ffb0149526f0eb4485d4c9523d05bb2d
font_02_sfnt_off00014108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14108 17272 bytes
SHA-256: 2546baaf34d9ef842dc0d740f57b00433bf11875dfa784563a3b2a0df2b3be7a