Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eb5bce12110dce…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 08:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0fd38cee105891e2df98faaf59e9d2b SHA-1: fb5ac3646625ea8b8e26b4c4370901585dddb6c1 SHA-256: 24eb5bce12110dce9bfaed645ffc1df68db8ba1c4eb7fe2e18012605aae4fcdb
196 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document instructs the user to copy and paste content into a shell, a common tactic for executing downloaded payloads. The numerous PDF links to potentially compromised CMS upload directories further support a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ugyvednok.hu/userfiles/file/murexigafifesonadu.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/14567637200.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bijaki.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a601b616d2797ab86bd09517737d661/33972585529.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/65151754279.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/zosamigowogop.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ibufoxodenidujasa.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7a041b5c15b710da2c0a861724eda873/57178245862.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7c7a36c7cb81d89da4911f390021e77d/71414817773.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b950e717f1d---fuluwodizisugagoso.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/46459357853.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e6f278e06cacc1138dca8e44e35cad96/81708395232.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/2830136154.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/50767666845.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/88038281367.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc502d5c70---91239701397.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/22bdee574e5c16b29f95ead62cf2bf00/tobafazogupej.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ef8231d1---fomeradaduwazisema.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/falatoxobomijukojod.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c5ja6adu9jvk473t65tpgnsr8/53093032056.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833c9758450---49241159444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=contract+extension+addendum+examplePDF 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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 10908 bytes
SHA-256: 54385bf322951644bc999ad017db0df82b0e7c5cd78ba3dab3a6183bd1a5603f
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 17816 bytes
SHA-256: 271cd5bbbd47d5ae0d8ea81299f95c2959331b4e80de9012807eb05ed576e7f6
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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