Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1080f6b1b17c56…

MALICIOUS

PDF

160.5 KB Created: 2021-08-16 15:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 88fb33476361e5bd37f3113f20b0fe83 SHA-1: 4d282919c0abf8aca88621c611fee20cb37669f1 SHA-256: 1f1080f6b1b17c566bf8217c5439c4d12bb746b3c09792aa6d795cc3c429d7b8
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=terex+650b+manual PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/wokolel.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4207bee565---kizirus.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f6b491f4---kadivoneribibibirebiru.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/43662667791.pdfIn PDF document text
    • https://4appsoftware.it/file/52113261474.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a45c00ae---jonimetapalufazoxitefigos.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/wifudedij.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/62426741776.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb351c047---jasidovuwulogit.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/13982463290.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf728065e0---nugepapepizudimopawuj.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/94413599412.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/xoxepepejinezimazemebe.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f5972a79347c3e1975d788a2c100a0f2/mozedozuvudojizi.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/jixixenipikesugesar.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/lodimelebut.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb165fe3b667f047665893b13f04228b/xemutuvabi.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_off000203d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203D0 10520 bytes
SHA-256: 6425e596e1222c6859e493178b0db1d217f2cf6a1133b61bdb8a8821211839d8
font_01_sfnt_off00021bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BCE 25312 bytes
SHA-256: 456dad25447b64f4d0b8524adcbc91745d7f13a3b39a995b5e1132479fcbecd7
font_02_sfnt_off00025b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.