Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f3f57598abeadc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54c47cb2054a10d7426c751705dd915d SHA-1: 1bcedc3dd1ee23d8cd62b3b4d99aeabbbfdf2b76 SHA-256: 64f3f57598abeadc60cb7e742f8db1ebf3846983c02508ef53705332199d7400
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple URLs, some hosted on potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kepco-group.com/uploaded_files/userfiles/files/74114661054.pdf In PDF document text
    • http://gainliving.com/upload/editor/file/32879851713.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/vefigaxixukugeviriva.pdfIn PDF document text
    • https://coevent.ru/upload/files/pasamiloz.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/24018211342.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/magunoxe.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1h17unnnhjejgco5vd8f652ef5/wuxomebukadape.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/wobuxipowomawif.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nifobawunexamonitoko.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c67957050---zudebos.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/83873326350.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130951d02687---tosomo.pdfIn PDF document text
    • https://cityface.cz/res/file/18755274519.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/97531005826.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/5566694194.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d333e4d223---pavulawosuvu.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/bejofififipe.pdfIn PDF document text
    • http://decorstore.eu/upload/file/folovakemifipimujabepek.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/48129186445.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/xidumawukaf.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/79329927778.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/zobuw.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/zimakowujixigil.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vivujusobatawaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=graph+calculator+3dPDF 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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 17088 bytes
SHA-256: 182004e87df72f9644f4e0156f200b9a434dd145f0710b4c96ad78a50c51b3ec
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10428 bytes
SHA-256: 4ae05251996513dfc0b84a71560e435de3627e7b828190c32d3fdcc66408e2e3
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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