Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e3cba88b58a0c8…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 387ca4ba51ab0535d3d7f876a489325b SHA-1: 3800973ab6ce886149ffafcc77f9a13c56a46bf9 SHA-256: 53e3cba88b58a0c8992c066926beac4542e06c28880a9716e17d17b0781e8579
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0b764a124224412f41de3888f608111a/60794017836.pdf In PDF document text
    • https://renetravel.ro/images/files/laxokuxez.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d02a4406d66af4a2c8460d83b8b39278/37159557029.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fidobejeribe.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pafukodubuxabodele.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097450126e1d---99255757988.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0f0041a---danomi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lovedegezevisimoro.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/7925501752.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/rekitasufelexebepasuvi.pdfIn PDF document text
    • https://atl-50.com/files/file/13098467100.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fb689cf59edef5a849304774562133dc/gosuguxuzomolodepikax.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8a2dc0ec19077cc4726021b99d46dd4e/gajiwinuwifosuteminapubo.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/pojixelumarevutupelovabok.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/53ae14540356b8c99b40fd325188321e/96357639049.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f54838c59---90953727564.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5337e31fabf0560e21dc6937135fcdbf/86358004238.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7eaabca08---32991262214.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57428adf5a---66220950804.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rikop.pdfIn PDF document text
    • https://ivanamihic.com//files/66169240950.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a09b1aff6---wosizepikalukotonixifapev.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860007e631e---lilamesaxawekivexumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+recover+deleted+messages+on+android+phonePDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 17132 bytes
SHA-256: c78cae9ab6040cae008337648f46efd4ba2db6e5127a68e205e44249184513df
font_01_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 11104 bytes
SHA-256: 4afe4163c0b340469af1995a976d5dfdc24088e9def0561d2081edbb6cb96cfa
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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