Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ed2231708560d3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 20:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cc916bda628538f35f15e03b9632732 SHA-1: 123cf740c947fd22d639cf02f89b6fbce98a9b3a SHA-256: c4ed2231708560d39e855ad5ecddd54eb744dc5b69638a5076f34add030b24aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggest it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to deceive users with lures like 'monster hunter massive hunting apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=monster+hunter+massive+hunting+apk PDF link annotation
    • http://hart-metale.pl/gimnazjum/userfiles/file/zepixeresavojudol.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/gokarafow.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nipixivomasinivoteba.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60041231911.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/52087186597.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/16324905673.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d9aa68b1ca430507a261e9ad24c7b39a/koxaz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141115a44635---sudasowi.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/3408072485.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_CB726834A240DE4E.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/90648803203.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rifopibukabi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73584592460.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14538016622.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uiur3ns9dt4palndmdh53hsuln/42989724652.pdfIn PDF document text
    • https://tigaintan.com/contents/files/pebosisuwabetatudiguju.pdfIn PDF document text
    • https://labelmarket.eu/data/file/xopiju.pdfIn PDF document text
    • https://mediaskills.rs/files/jopizosim.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/46375410971.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/74285644437.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/51470744948.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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 10904 bytes
SHA-256: ec8410869e84622d440b4907d3d889bbe15181f7fd11c566db97939a3a3228ec
font_01_sfnt_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 18136 bytes
SHA-256: 195f80f3533352e297050ad12f4b81ce78400c1b7c2619d6a28d241e6583dda6
font_02_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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