Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d32219f65044d5…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 13:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b20e170ac7a1eea0861fbf08b12be8af SHA-1: 1f80ac21b16f76351ce6da8dda6f7868114c0c54 SHA-256: 90d32219f65044d5c4ffb8e21abc5d2ae9f46586440f247c92d640b4c8237fd5
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to compromised WordPress uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://narellesastro.com/userfiles/files/44822013473.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/bubun.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1574f649---wofexapajikobezesamik.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/19337135808.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/61088888229.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dcf8af20---90674060527.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/texuzedapopajuwekegaja.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/92963288535.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/pefazukizavawiriwizen.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/momusona.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516264c5---sifutirakap.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/zifufewijimu.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/zojapezidoxuw.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kimamipobetu.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/detigibut.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zoxigilivokosubep.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wevurufidisilejuvase.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/212144047194.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/3399697417.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/83369446832.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gekenaxek.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/jivojodageb.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/42491802525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+a+formal+addressPDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 10488 bytes
SHA-256: e915913b58cc44889441e764c3c119a69cd43ce22318dc395b97945d10ae134d
font_01_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 16012 bytes
SHA-256: 9b7d33ab392fbac7742af0f56a978b771f35173dbbe8f1dabd3621c8dc097da9
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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