Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b391b0ef70aec0c…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 03:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bebbf97721e2d0b939bfe64d805b4c1 SHA-1: 74ba4f2762053bde7c49cec8a3e19602633844c7 SHA-256: 8b391b0ef70aec0c63dfc16ce727abee40ad86879f25951db4f42ed1d9fa11ed
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, some hosted on compromised WordPress uploads, and uses a link farm technique. Crucially, it includes a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, a common method for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://crysiq.ru/uplcv?utm_term=eclipse+java+ee+linux+ubuntu PDF link annotation
    • https://ldcpc.com/ckfinder/userfiles/files/72183034316.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8722e3ea2e---ruganelubixapetudabefuku.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/17344639806.pdfIn PDF document text
    • http://someteme.com/archivos/_20210629232022.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a264d73aa36---kukejeburugigifu.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/67416396802.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/11561453830.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/jeduwukoduzelesa.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/93112927461.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc00430bd---dalagokizag.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/75752642400.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1521052eef86c04f7de249b415afb672/xopatebenasujijale.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/95927760112.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/76ec665728056bc32d5ecb876f0422b5/77997234656.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a13bb13fe---32751511391.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acae9a9b9f---45527027236.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d332c2d8b499f3658147a1e74da98563/resojo.pdfIn PDF document text
    • http://iccarrentals.com/files/file/93782372159.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcc0b9403---10882851628.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5qmditfajnjpsoik4hr4ccnfob/kapiniwojew.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/36660963988.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/463294476f54917e064f21acddf1432e/fijazi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5a18be577ea99bfee1d508654c8a4681/80049704199.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2480bc11---82115007322.pdfIn PDF document text
    • 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_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10668 bytes
SHA-256: 55571dfc69bb3a89a9c1a917e68b77640d6f0c0decd7065a1f975ab9f6573cf8
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 18144 bytes
SHA-256: f0c564823355353b3a3beccb5b478110aca502116b6ad8f984a2ba15bb7d6511

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