Malicious PDF — malware analysis report

Static analysis result for SHA-256 1250d81bf2bae4e9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 05:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15cfba7f0d9fd5d1cf461551d5c6dcec SHA-1: d99c8b21c9efb6bb7d860967ee6761cfe71314df SHA-256: 1250d81bf2bae4e95680be18b21252294355206214c9a969246409dee3f819e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=pagalworld+south+movie+download+2020 PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/91123256113.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/50026231383.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/10081344894.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fbe4155f---84497969676.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/wusadefuzanivubadenugofup.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/46601842556.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48955022508.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/21137426781.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/88144284810.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/88036532759.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2f5apsqoipo0t1kofl9n1k6r7b/96146058734.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2e745f29---gutorimopaxiniwi.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/wekarerezoj.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xisirolubinozeku.pdfIn PDF document text
    • https://anapobolivia.org/userfiles/file/jefeguviguwis.pdfIn PDF document text
    • http://mayjack.com/upload/files/kopenozobedaz.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/gitefokejujewa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab28f29bc---paxekorawit.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/47952079231.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/47164637756.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16150b356608be---galik.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/vapaxisukiredavaxu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210905095526.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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 11188 bytes
SHA-256: 1e4c00cc50680afae45a8af891421e08b686db421193c558e5b067e326f38afc
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 17780 bytes
SHA-256: 1bcf186cf4bfbd5e477d6f42c151514c1bf19a2e9d9c4a6f7db23f87468e0974

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