Malicious PDF — malware analysis report

Static analysis result for SHA-256 43764eebecf50501…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 04:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15d7f3ba9009f1480ffdbd0fff5fe9b4 SHA-1: 9dbe1dcfda23775338167ffff96303ae4f1dec49 SHA-256: 43764eebecf505013f58c779d12a7cbc8ee1921fd7db4c82efe0f575873d7513
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a lure for clipboard command execution. The document likely aims to trick users into copying and pasting commands into their shell, which would facilitate the download and execution of a secondary payload. Several URLs hosted on compromised or disposable domains were extracted, suggesting a distribution mechanism for further stages.

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://richmore.kr/uploadfile/fckeditor/file/vumifibegekut.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/15797883645.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/wefakunotipulewovo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9511b16e3e7c949ef0bb89a2621566b4/58795380944.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e27ae358f4b---78306563469.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/91772790593.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/xigamox.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nakot.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042005b4f16---11440489367.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4143bb1eb---63575870816.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f6349630---50302204172.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/woralotudigapafixejul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8a487c56---nusir.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63a96bbda---rosumim.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/21ce532ba327e4536e4a4415e991d0b5/57524328590.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/lesaloguwoj.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/konimade.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/webito.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/e2lr9ln0qi8k2jhl5ensph348d/17010519839.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/zetobowirijuke.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/1438089418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zyxel+router+configuration+pdfPDF 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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 18820 bytes
SHA-256: 7b6b5e39f48ea83a9feec456835a62c023b629d93f0f8c2a7a21d5c15770fcac
font_01_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 10904 bytes
SHA-256: 194ef2df322c17873314226cf16e646dbf6503cf530dbc0951677437c067f24f

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