Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b1aba85cc70056…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 00:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3fe35d5d7feb84fd82d8f65c5a2fa3e2 SHA-1: d8e105339f7d3a7b1ef801eb11f4b0be45cadf96 SHA-256: d8b1aba85cc700569dee4ef0baa56e96e55bca9fd6425784f3087d323598e26a
244 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external URLs, many of which are hosted on compromised or disposable domains. Heuristics indicate social engineering tactics, specifically instructing the user to copy/paste commands into a terminal (ClickFix attack), which is a common method to bypass macro restrictions and execute malicious code. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 9

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=macos+iso+to+usb PDF link annotation
    • https://acavacecio.it/userfiles/files/zetedetom.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/31953351302.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/sidaredomaduvafed.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/xarozuwogaxe.pdfIn PDF document text
    • https://zold-kommando.hu/files/52500686488.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/wuvoloworidekugakoguzo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9150d257---92036150454.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160984f38822d8---dumomukagolufi.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lewosegufafonexekupun.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e079c662542---6493778794.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/10508421342.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/36965503844.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/94954340985.pdfIn PDF document text
    • http://co-mit.com/uploads/files/rulakigaru.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/kekefu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d9d82492ce68bfebe4d15ea4ec963383/69131132189.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/87190253157.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2d03e478a---kazalarugexoxi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb60a709a8---28317886810.pdfIn PDF document text
    • https://guijek.com/userfiles/file/1443648435.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/lodisa.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fagisufamekibunurunenigo.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zagifivugerijato.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/22331260670.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/55809292940.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a55a53963---nodidoxajagosakaliku.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_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10072 bytes
SHA-256: 124803e53b32afcf392292909b0a957a2fd86ceb35fd94bd6f3a621fcef8db05
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 18700 bytes
SHA-256: accde0614949a3cccd288bc3312132300d1064ce2404f1866ad7e88017522e4d
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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