Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dd41cbb9e2f70e…

MALICIOUS

PDF

101.2 KB Created: 2021-09-07 18:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 343dcb0a7e9b42b9ad4812124d7c5d97 SHA-1: 00466291a383403b7a1c740eabe24e4dd29a950d SHA-256: d3dd41cbb9e2f70ed38a37ec60b0050e111e2a8376f0f32bd646f7440f2a1012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure of the PDF itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9ccef2586a61cb69a5434c869bac4d3b/vavusolukumipoxuxipexud.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/gokalowaralarefojabeweb.pdfIn PDF document text
    • https://baglab.pl/galeria/file/80235603873.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/37122524154.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ec6f2aff6fb89772fb82f5f1ffb9b024/8259747003.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/10323910940.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/disoxo.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/53979225785.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/20707308210.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/61593404258.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/rudibelujomuzowa.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4d3821921270209e0f1cfc54482f7af0/gewebab.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/39050766481.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/27d22d7765cd247b3614fca86ddb8e3b/85662623927.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/41998540392.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/60756996416.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b1592eed0c7b4d14c19737fd9fb34348/49379537814.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbac4eb24c---51144167242.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/renojilidakukesugus.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/rusotas.pdfIn PDF document text
    • http://szwygs.com/upload/73478513500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=coons+patch+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_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 10376 bytes
SHA-256: 94773ad7a7cf0db8b40f97b7e8d04f95cc93c03215f6d78dad4458303b19c5e7
font_01_sfnt_off00013cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 19524 bytes
SHA-256: 767e0dbdf0e225f0e7b0a61749a60c79c620001c1552ac0da7c16c4ddbd6486a
font_02_sfnt_off00016fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1