Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c099d2d6bfc6b8…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 02:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cbab19438e39cc3b895bb39c55d2ef6c SHA-1: 5d0736d8b9b03f561321f0b8d9c6d6c248eb0e1d SHA-256: 45c099d2d6bfc6b88dfddf3adef6dbb3bd4257b3fe32207fe3d1a04dcd3e8c74
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised CMS platforms, which likely serve as a link farm to direct users to malicious content. The presence of a URL with a 'download' term suggests a lure for users seeking specific files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=download+6lack+songs+mp3 PDF link annotation
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/crm6avb71i2bedlupbkepjoruv/42700168080.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/sajoxamuvafegamawo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xoxedadesugu.pdfIn PDF document text
    • https://taperagi.com/contents//files/kilixonuboxef.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/35667049181.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/takakijujipasevi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ad353c03740d2bc7de45fc2e4a988d19/28944739707.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///51150674582.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e71cf054---30251324716.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/13947393860.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fegadowaxulabasil.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/mimonisabuvop.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f359e29ab---88076304806.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784a3a484bc---jebasatijuwozemutirezofax.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8517d3484c---29205993120.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c0952809efa---bupakegakokasemoxiw.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/85707884788.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ddbf14faf365c306c607904b672e395e/57920980339.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/belotisolore.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e94f4192e1d8d86a151e6cada52218a3/62456879382.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d846f18e5cb---47779738147.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/nopusajavunoxegojolivav.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u7mni785jfbdphrv1cig9fbe9i/fegovabelumi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/22727236274.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d489771ad347b557dfce1244d8c455e8/zulerobubavudoni.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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 17096 bytes
SHA-256: 16defe116230d4b320283d0349af67e3e9d8041303b45c50d0d74fd777c18074
font_02_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 10952 bytes
SHA-256: 1a3e6e832df3e238cd7290421847246284a9b1a083140217cb0ac6f2dac82115

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