Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0769a0988ca3260…

MALICIOUS

PDF

89.4 KB Created: 2021-09-11 01:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13d1c44d702a0e5af4b7d47a5f57f110 SHA-1: f111faa911f918d97d1272775d6a898d1c963947 SHA-256: c0769a0988ca32605185962c37cb983bbc9bf49e7793a2db912f58441ee78ffe
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command lure' heuristic, indicating it instructs the user to copy and paste commands into a shell. This is a common technique to bypass simple script execution restrictions and download further malicious content. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a link farm designed to host and distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b925982232---83461624474.pdf In PDF document text
    • https://panelshock.com/userfiles/file/50517032439.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/28512041168.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109010613584999.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/42046036514.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630518454.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/40389214746.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/31612843727.pdfIn PDF document text
    • http://guchen.ru/d/files/24448167824.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rijokufu.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladojowujubumadamugiwefu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fidafalefe.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/16382660152.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/91970593510.pdfIn PDF document text
    • https://dafelia.com/files/wikubumexara.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mumotuwugevewazu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88381139802.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1cdadd23---nefotamanepobetudajufuk.pdfIn PDF document text
    • https://ratosatu.com/contents/files/tukef.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9aaca657c---jonazixuvesilotulakabe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323c2b47441---19258641532.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/83043666964.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ae4ea3a2---binasodividipewidix.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3625e66a6---53780691251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mac+frozen+at+login+screenPDF 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_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 18904 bytes
SHA-256: 76c6ba25fa49fed7f4e7713773add37c46a89b5676dccee30eff4346d0d84802
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F96 10564 bytes
SHA-256: 1e5cedd7e9afd08fa6279f86a0ad407fa7519f3b734aeb5b2b55f94f9212f635

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