Malicious PDF — malware analysis report

Static analysis result for SHA-256 af95fedf81d0de07…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 05:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a3f1eaa37ca9ef5200313ec0b74ac43 SHA-1: 86927e6669f0d978fe2392e8985b3d86d67574c1 SHA-256: af95fedf81d0de07d61570b7a26261a178b83b3fde88e3a52d05ac379cc65d8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support a malicious intent, likely for distributing malware or facilitating phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://legend-chang.com/UserFiles/files/bopudexodakizinerowamab.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/247e8738c5e52a50874d3e95d2fb64c9/gulajeti.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/08qgrqbtqdar37usjncrb6bver/gesogukotawa.pdfIn PDF document text
    • https://rosycaffe.com/file/56205095802.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rojulixidenagomuxepefazof.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b11bf3cfaffb266a167c52147ed8db1a/lefagotubux.pdfIn PDF document text
    • http://bienbao.net/uploads/files/63507360337.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6acbd2f392---27756544705.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4t7erop3pg8io4c33v78dn0bf4/44968435480.pdfIn PDF document text
    • http://rayanchem.com/d/files/90857630887.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42532749308.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a82426b2---zenitizovukitadofisole.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e20713c0---wuvezutusogapuro.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/piputoruxalo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a0432c6a---54749253339.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/81116916568.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/madub.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/xexelej.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lekogimegusigipexigemus.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zekisasani.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/95550902542.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/80394136242.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2h7on0uhqp22d38nms03m8ejpo/rixusalodariwuboba.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/78550676491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ableton+live+9+suite+manual+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_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 11012 bytes
SHA-256: 80584739d7bb5e3b2be68afc4e4c6a8ec5cde0b40fed8f9906a154557bb136ae
font_01_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 18388 bytes
SHA-256: 837d878ad9943c9ad08ac76c994d37e886cef134025c14190aa9af53059fadb4

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