Malicious PDF — malware analysis report

Static analysis result for SHA-256 5453b0f1247e15d8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 13:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb3283aa806b481458076073ea34f125 SHA-1: f77d6078543cc669fd56b435fc54df725bb2b2c9 SHA-256: 5453b0f1247e15d80d44f1290196ad3db5d799d0dc8a3a9f3e75f8bdd85b9114
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The presence of numerous links to potentially compromised WordPress sites and disposable hosting suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall behavior points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • 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 https://zhansq.cn/upload/file/butizefi.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/15168339557.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gj3h0obb5chfkkfu4vjtopu9c6/dejipulefaduzesodexurowut.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/lekobekefiwafogopafixe.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/4901976717.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/97409895156.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209d0ade602---46105190994.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0pfkgu27jmmafg8c2oh6k8kkuo/fepazapasemifaxufowoku.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kesuvuzoxobumosamifot.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/bc132c15a6837ead8673a433891ccd57/8813019090.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6e6aec52---68516589804.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd284ab87---fuwedikofilosijogamixe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/litot.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21828690731.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/44604220566.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a7ce9aa6---resajoximuxuwinoravega.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7ee901f7d---lusuzad.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96995e50f---25689506695.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/73239402991.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/6513173070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+you+cut+and+paste+from+a+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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 17780 bytes
SHA-256: 62be11214ade7b25b3e52597f6e3d54ff8285383df4dfe74e62a219a90559462
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 10888 bytes
SHA-256: 503e8c59dbea8bce7f366f1c71a73bce127eb75b2370a564d8936a1f66b86c53

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