Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc344f8332442e9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 18:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bf952f9ce8b7ad2072ab5cd231b7107 SHA-1: 15dc794e8a417f0655556708f84b93bb38cdd152 SHA-256: 8dc344f8332442e9e35c5f0ce1405072072139eb5579b3b9208cff76eb57199b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1203 Exploitation for Client Execution

This PDF document exhibits social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a terminal. This is a common method to bypass macro restrictions and execute malicious code, likely a second-stage payload. The presence of numerous links to potentially compromised websites and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • 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.
  • 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://ch-bovi.com/upload/files/4058421753.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4bc3d075785439053b7a45d1ac6acd2d/derurabosunatekow.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/93170900165.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e90395cd1---fenademejujigofi.pdfIn PDF document text
    • http://czyxchem.com/upload/files/batagizugamezuzo.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/77907304875.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xoxonizirajarakuw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/611h4ahsf5t6albuagm1lpn1mj/6630911886.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/56992029696.pdfIn PDF document text
    • https://adikmanis.com/contents/files/51272278017.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fesubijaxakanujaj.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/63296050777.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/melopowogilavonugojiwiza.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/59090076592.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/gutewuvenifijonan.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1ccbd5f470d5d5caf01b34e0b5e07932/lonabexadipawaju.pdfIn PDF document text
    • http://eichler-kammerer.de/rizaxexonabef.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210917063748.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bobopunidalijijididaj.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/84170353985.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9258f0cc1aa25f71695d8b1911bbda5d/97857511347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=modern+setup+host+has+stopped+working+windows+10+updatePDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 11072 bytes
SHA-256: 9871dcdb7f9d9d2ed3d8017ec199f450c8f46880c97a1cc9585c596ebf4725ef
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 17676 bytes
SHA-256: a1823ff774c10bc62187606a8e07fd8f70590276bfb6106c2d4e0048c8ead948

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