Malicious PDF — malware analysis report

Static analysis result for SHA-256 273b8d5224c6a246…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d18e9ce9d914143cd4c1a45cdc0d4910 SHA-1: fd3cec5d0c4d0c8fced300b7460c447004c1e437 SHA-256: 273b8d5224c6a246f069b4f043570859f6af97bbf63de3561084a51ccfaf8463
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=how+to+access+a+qr+code+on+iphone PDF link annotation
    • http://nceed.kr/pds/userfiles/files/kexoxuvowufupekozirapija.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aacd7bd676ea1bb5cdf35d3db1ccea83/73869337172.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/27726548674.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/47343914923.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/lovubotu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3d98f8a---68709167875.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/81971239274.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/busekobebibozobalifonoteb.pdfIn PDF document text
    • http://farmina.ru/uploads/files/teterape.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/luduru.pdfIn PDF document text
    • https://angkalaris.com/contents/files/1375192122.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109181845196578.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614635abf0db8---67400909406.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e7df815bfe34e030a79d298ea719e71b/17062254078.pdfIn PDF document text
    • http://standardamulet.com/files/files/xofofupoviwotorobowiwikif.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sukoxipanorunuguvebeve.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b249607b---97388486751.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/q58hsc6mhg78sh1uu7pii7jlfq/siwag.pdfIn PDF document text
    • https://izometal.net/mm/file/6654395800.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/26766016122.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/jenijukunibi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d8a61bdc24253cd6ae30584dcb429f14/72827734343.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/kideramenipipeti.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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17112 bytes
SHA-256: 9420766c432b39bcefad74372e33d6e95d8ddd740ba2ad8f035ee1b4b1c13b68
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 10788 bytes
SHA-256: 3886d8b0bd538354bc4fe3d2f9a8f3cae05996327ad56a453e1514e28b5e48ef

Open this report in the interactive analyzer, or submit your own file for analysis.