Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c574262cc40775…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 03:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c1c676060fc71cbf05a385bc13ad324 SHA-1: 1cb80eb20da27dd32407f21800b23725e8beb458 SHA-256: f6c574262cc40775bbe99f589c1413245d089c83efbf85e4f0882557b072cf6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is unreadable, but the heuristic findings and URL analysis suggest a link farm designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f0334d6e---sumuzotarazegofufulo.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c92071d---79877970844.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/jurutaluzetawijo.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/jinogexazexemojimulibikid.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a610c4caa---89704163059.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/85913403364.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c693c59d30---zuvajuvebotobuvukuw.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/3836323219.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/midunegisevemiku.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zekisuxosunupusuwilepe.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6bdf012b6---dubuwafizakumazux.pdfIn PDF document text
    • https://led7.ru/file/78296349092.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210701190357.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/t0fn8a1jfq7pgeaeqeq07bduo6/45044509215.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/62776453435.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/269eqjett2qajbi5nhaumq6hf9/kopulovekoteranisujeju.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062802184849.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/234b8960c75cfb1194e3645847a6341d/wutup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089276eec02b---kasagir.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///8455634882.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/bipupizoborokopimajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=polari+dictionary+pdfPDF 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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 16544 bytes
SHA-256: 4e67cf1ef9d5022c7d6082e293affdd29dff65f8c74b8857111bf8cc9a567cca
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 10428 bytes
SHA-256: 242255db854c4a84ec4c2e7206532718f6d4891c39b25ccd75f844edf5554057
font_02_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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