Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bae9c5b14991aec…

MALICIOUS

PDF

87.7 KB Created: 2021-08-11 21:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bc80767b4120229c805045f0e737f4b SHA-1: 26935d0e23106a0541429305b620cb4827cbda6e SHA-256: 6bae9c5b14991aec4f1f52a3a6a46d47dd74c1b20311bcee4964bc09658b2e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves redirecting users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=hulu+plans+student PDF link annotation
    • https://batikatravels.com/userfiles/file/93130460109.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/pazilijosoda.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607654a43a1e2---95269684539.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zadema.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/519826e057c82f78d7d44c9677de2418/jipiwimuwivevufe.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/firemelefe.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/75146511107.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/44779918703.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/40b063e599e34e580d4bf040806fc4b6/rebemul.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045aab91abc---55139926567.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/36bef8b59a2e0029cb7f8b8b39f382af/56308956512.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/71243710257.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/dupixujagadukenirekifegop.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1832b7eba3---xojemeviluteviwolokim.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/2815532377.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/5793048762.pdfIn PDF document text
    • https://ckmandarin.com/uploads/zorunixubun.pdfIn PDF document text
    • https://o-dance.com/upload/files/88771643426.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/terusasafuwevo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5d22673a---nodibirum.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092995f3db79---34022599825.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98c7c8da6---34524321825.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0eba1c5fd3edc54b9d37bbf4dcf7761b/62569448158.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/wejuwulesosovonarenin.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941fce41cc3---makivedekipuzomewideku.pdfIn PDF document text
    • 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10164 bytes
SHA-256: f01c1c78a3868d97ab27c92dace23e95d79a2a1a91ea012a7ca247b39572de12
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 17052 bytes
SHA-256: 3a2596ca991f3e50596e181d8ccc77841df185023e39364e7f1a6cb5c033884d
font_02_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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