Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa9a93376e9f326…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 23:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528a6dea4d87b371fd80f6291640d205 SHA-1: a746cb1701df2a17baaf594ef7e43c3d8c88dbcd SHA-256: 1fa9a93376e9f32646d8292d389b2f9cdfa09c8c953f8fe5fc2f66a5892fe813
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. Several URLs hosted on compromised CMS uploads were extracted, pointing to potential staging locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338e934faa---zapedafu.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091218a3f2e1---xowakudolamavoxazos.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a12958c3---nodagujod.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d9652d58---patifodiruredatuxijov.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddaeb8745---58173385787.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q92jbdn71mis2k8ocmkss83sc4/47354005769.pdf
    • http://boeschfamilytravels.com/clients/43210/File/watazubozovipefesobe.pdf
    • http://cartopack.com/Images/file/93398752749.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/057012c87af9bc4d3649149db5e42c9b/52235131840.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a267b32b0---93712106624.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jf12atj49lcdddelkdqssptn24/pefuvajija.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3feb3122b---90335269390.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a2f57e86aa2c43e2e2eaf3f6b665baa9/lajitegetodeza.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e627e7d1---fekuwimitijomi.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f5444878bf6a43ca92c1b681a66f560e/rosixepefi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831ac6b0d8a---32381475616.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7ovgpcc7m7d0i8tkl77f6btnlo/32262842185.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6a361b4a---tajor.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f27a289887633cd134e421091f479a2c/lelorojodevamamonamesuwo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fa84c88ed4207f86e2f018014d40d30b/97381405643.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8012ed131f---relananemubudozira.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a408270f7e7---sesisezejukope.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=is+it+possible+to+download+windows+on+a+chromebook
    • 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_off0000f63e.bin
687c42ef8a86539bb9158ee852a750215474538c8c7dff9693c1d7e4d7f25062		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 17120 bytes
font_01_sfnt_off000122ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
font_02_sfnt_off00013b03.bin
040ee53320c5d6b7b0170b3b16b69982f84be90f89a792244d0e6149d7c86eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 11048 bytes

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