Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7e139aa9e417e3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1356bd261aa7316c95e0f45108fa3466 SHA-1: 54fdb3ee549286a433960e0e07335862cfcb70e2 SHA-256: 7b7e139aa9e417e33320081e0150cb6130abcfdb7ab3a9e0018dcb7774290475
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=pinacol+rearrangement+mechanism+pdf PDF link annotation
    • http://foto-klub.dk/userfiles/file/korugorenezil.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/54704963349.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/9323729581.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108131243472322.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/2705304798.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94567674259.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/50246922710.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda713eb757---romujik.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/86358315598.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a864acc2---70050418407.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/vupevinakezidabizedavoj.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/lapotaxose.pdfIn PDF document text
    • http://talesma.com/E/file/kutinaxixotulinojuw.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/24454005025.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/bunido.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e179a2543d5c05a1d46aadc18b480b3/50408647066.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c750ce3e790---zanalomakudufivi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe5020eb7---pixofexixi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72e56e4d1---87909570052.pdfIn PDF document text
    • https://promise-land.com/upload/file/67150962580.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/78191159836.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/molimogikapa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c474bb992---topajubowoxetipebe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16108fcc8c49ce---lidurajoj.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 11068 bytes
SHA-256: 9033551ae1402115858e74384eb36cee02faecf54941c5123cc4cf5dba31e02d
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 18448 bytes
SHA-256: d6ed6cafc8833b4822569b38a2adb10e63206a2d8fee1f8f270432c59f92406b
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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