Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5f8ffedefb4426…

MALICIOUS

PDF

88.9 KB Created: 2021-07-30 02:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2015554ab3ac46b16e3f775f926c4cc0 SHA-1: 5d8f7e85f59e7d73b90140cb04d73ed2a238ae35 SHA-256: cf5f8ffedefb4426bd46ee5bb44fad5888ae6c11787e27ba07720bd6e4ae82b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing traffic for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=what+is+airline+ticket+number+cebu+pacific PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2635c369b2---kikutex.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac612c333---73306522768.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/10919056320.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/650892732.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6e1bb107---1415204535.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/72333348547.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/91764941554.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sezabomud.pdfIn PDF document text
    • http://devison-matras.com/upload/file/tuxonugexafab.pdfIn PDF document text
    • http://chieucoingason.vn/files/sixokotaz.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/butizezozugikigutejux.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30055a8e5---pedalidomebixujupuki.pdfIn PDF document text
    • http://edgecs.net/documents/poselotarosaxe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ee04d2ce---31306748103.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/wojaboral.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/84807767123.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d823f2d143ef50d7ebb9b6b10e57ece3/sulumat.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/81728591820.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3f0h85i4tfs52a2gbs96q13u54/laxali.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4deb8d549---zoneketomiluxojozesakepa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee555a0ec---giniveperomapofo.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wesafigofavobelesefop.pdfIn PDF document text
    • http://capital96.com/userfiles/file/35845157344.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9fa594c093772d950262bca0591a65ce/poxidenedizupifu.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dipabewepuletatulowow.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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10948 bytes
SHA-256: ba67ff668e26c155c2e26b3839b849dca9b0cec1bff053d9889541ae9d747ff5
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 16644 bytes
SHA-256: c61ef5bb900943dfc6fdf2c0c394ce4ba1c535d9a66de3c6e8bbd8f32ca648b8

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