Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9650bdea90c50ad…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 10:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbed0b36811c9d56d1d927dadf6a2fb4 SHA-1: 5deae6084ed6805a5637ac7e6e5817d568c56768 SHA-256: b9650bdea90c50ad31f62cafd162403834570fb0d7eb544a5ad19b027c20d315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing or malware distribution campaign.

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://elitstroycraft.ru/source/file/puvojodanipekizaguwune.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756df923479---79325423998.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/53198602860.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/vanugitafubukixotubut.pdfIn PDF document text
    • http://hiniceshine.com/upload/tibebaxivam.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/eb0c0f1ad5823f52efe05ebf27d50d0a/99978516644.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/jipixe.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f5da83e7639ad47b84e34e77a9d6bcd/12962015626.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/20199894092.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/19005616683.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/dijevonusurojuzizajo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vulasol.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/604b50f62b5871db5889eddbe6959159/36358075665.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/wutezevomelego.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f392469861---48881045919.pdfIn PDF document text
    • http://sns.hu/_user/file/72941708615.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b543179f5---23760486461.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/18911494523.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074370664771---73630547289.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ravepelemekilajedegejat.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/12128893823.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6krkkl1cisi1q4dio3r0d04r67/pilikug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=you+are+worthy+oh+lord+invisible+god+lyricsPDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 18780 bytes
SHA-256: 05c257d7a0a08fc106cd3b212e9ca59cfa49467f44cd4f8a5e0cbebeca3dfe24
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 11136 bytes
SHA-256: 006b63a301564008fddafbde2ab35b19d25a8f5541788fb2d395a4daa020fe37
font_02_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1