Malicious PDF — malware analysis report

Static analysis result for SHA-256 be12ce32be0dda7e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-03 08:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7641dee1e4a03b6196916cc7ec85b63f SHA-1: d76fc1e3e1ef3a1aba43180b997205fbf810a63b SHA-256: be12ce32be0dda7e6569d679cc79a7a4e145490b6a03a43fe5c5bb3fe5ed2bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shopinhome.com/ci/userfiles/files/28401682406.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd8c55a655---nupawanuled.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vadidem.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kopumepi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210604_2E967A967C5AD572.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/25942343538.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d1c6131778a2e8ceee24ceee99acfb4f/rulomozekojazimavudukizi.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/31047483281.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/furirofenal.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/13299604392.pdfIn PDF document text
    • https://jin-ji.com/upload/files/genupokawawunegi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/litupabuno.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fuxoladulifuput.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/rewimoliruradolepebi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de6a86788---xikoven.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/28381529239.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/vovadosokeko.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c8d436bf6b6307ff169a072c64525a35/24409091738.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/gepexapisefix.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/mopid.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce592acedf---95968357656.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/tuwifavevutojaf.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623811511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tipos+de+publicidad+y+propaganda+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/75f614bbc574051230c4905858f3f3fd/60621964870.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 19272 bytes
SHA-256: 883d63569f5191cd539e49946d752d158d44a54ad0d97a6097d1c733e2a2eb87
font_01_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 11012 bytes
SHA-256: 8959baa66cca3c63ab197131d3d4c4e6cec4e709b56a86431ab8138d4f742a94

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