Malicious PDF — malware analysis report

Static analysis result for SHA-256 de23c6b4e6722275…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 23:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cde1dc4da7c03a8460d43428155926e1 SHA-1: f39742e518689da550b1b677b62a009401750c39 SHA-256: de23c6b4e6722275a7b0da3b065595647c9185dfc2f373faec376105f31694d2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, with several heuristics indicating a link farm on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://filippodelvita.com/demo/userfiles/file/bitivevimur.pdf In PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/88301465645.pdfIn PDF document text
    • https://digireg.nz/upload/8444034390.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50399490162.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/74913388420.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/68627802120.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/50724966237.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/nunis.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b76541ea9de019466eccfd31755f616/93053915940.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3627adaa---42128006479.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/12416918089.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/buzejulotazisufumibaka.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bulalapitorowogu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/xinubovokakosenemunejoni.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/02aed4a19d35f5037014d51ff23a39e5/74270943169.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/40229898086.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/zitixebapetuv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d13e4ba0fa6fd848349628efabfa3303/fisiwitugizuwaxodor.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/lamuvipexesegekaxerob.pdfIn PDF document text
    • http://darec.sk/files/files/85772022858.pdfIn PDF document text
    • http://kgmda.com/upload/files/weruwadigidudowax.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/67982528026.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/25761448424.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/96362140756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+phone+ka+wallpaperPDF 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_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 15848 bytes
SHA-256: d2caf57392717f5ef5d0c1169cefe82b2acefcf23e7e4bf04cfa0f03d62db5df
font_02_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10380 bytes
SHA-256: 0321e2cc072cb3d7dfe4dffd2e4e8890d6184c161b3b79d24c2cb452c240b21f

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