Malicious PDF — malware analysis report

Static analysis result for SHA-256 8033ac09eecb8f46…

MALICIOUS

PDF

90.6 KB Created: 2021-07-13 16:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e34115f2fb653f49afcf61f30bb2234 SHA-1: 90613c24fbff6abd16c671f1c6c62b16cf90fefc SHA-256: 8033ac09eecb8f46a2df6a3f8b4c61948e512cc8474330d48d0b5ede75fc433f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f7ki601cd639hk1hagnd9u3sc3/rigiketoduxolibefenafoxox.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e10f77488---rorajodi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408267e649---lukakaruvadunamudimul.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/zamozikojiriraruwugariri.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/poduxagodalawugidizowovo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cb31ef2641054c538a470e24e8cd7204/notarusumuduxavoxe.pdfIn PDF document text
    • http://beiks.info/public/file/18741799570.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/24343287580.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vlt336l7n0h4er1mgm20v56up2/766149571.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b800542693b307b281359d0a7cae1e86/25606021997.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jimuwapi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b17d33a2ca2---70787153070.pdfIn PDF document text
    • http://envigest.cz/upload/file/79402376024.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0e8d9482a870136ea953318a9852928f/menofakusejalukipiwilo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2b47256c40048521bfa54bb75a6527a1/kasagavam.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/68120230831.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/24838939970.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/33782193442.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d7d88d373df70c329e303d7ba35ec7a0/59642010155.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xoxovezezopusodelelon.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/wowetevidadibakajebe.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8a7a14cacc34324cc32fadf6cb59fbb4/refusezapimadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=counter+strike+in+real+lifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 18132 bytes
SHA-256: f93ff90d2dd4b7d2023724a780559a104c5b9ca8b4077a83060708e4f2ce11e0
font_02_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 10428 bytes
SHA-256: ffefcb1a1203479e222f66fb149461b42201a16f722e8886188e535c82ff610f
font_03_sfnt_off00014f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4C 3436 bytes
SHA-256: 07c5a5147fc96181f03871e564c13ad76dc9393fdc269e65ddd9850f89b593a6

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