Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cd1da3a911767a…

MALICIOUS

PDF

77.9 KB Created: 2021-07-08 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8a7bd82f5d8d0f99e78d13b5440c0f4d SHA-1: 920d20cff45e811209e2cb05d59e4a61e560c5f0 SHA-256: 98cd1da3a911767ae4b22a76b23ae2d5f3181f3468e2f83c2109649981c42353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to manipulate search engine results or host malicious payloads. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://dok-vo.ru/userfiles/file/kirefojebebawinagupukim.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/61420688752.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e68c90a762e62931435aa7b333237365/32792453064.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ff418d68---58909449245.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nabozuxafagonedunamopoja.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/83857574865.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6f57a1ac713763553b67db885866c109/3649507996.pdfIn PDF document text
    • http://beateromer.com/bilder/file/73255907883.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cc660bf3---38660255422.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/fubejutomuvirugepumilo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d00e67d1b6daf067f82954d3008294b5/jojurasiwepavamumufos.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210601204648.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zeruvubepesexubisorizuxu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60d0b0abf---56847224412.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac410c9e015---jukokifoj.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/40766268256.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071596d09118---8506122275.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9e53ab5df4bd694a93fb06352b7c226e/sideduwafurufinirivufi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/18693797635.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fd555g0f66b6v390auv66j9nc7/51513758324.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4c8f6c1---donizurimifatamu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dc53f3ebea360cc82d0a4677a4ec4b35/fasogapowulig.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/83370974450.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/24860420759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kenmore+chest+freezer+owners+manualPDF link annotation
    • 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_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 18636 bytes
SHA-256: cf6c8fc4b0e3b25fd46b3784e508688816aace8c0f8d4af0c46dec1dadc608c0
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 10748 bytes
SHA-256: f8a7847cdf7197244e07c9004910a9b97dbf2f233924d76b77c9fabc9b83dd34

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