Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa0a1a595e963c2…

MALICIOUS

PDF

81.6 KB Created: 2021-08-26 23:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7ff742d4ae3df00cb8009ef31faec5e SHA-1: 107b83113966ece4f7ae6c0ce4ee6319cc34ce16 SHA-256: cfa0a1a595e963c228b72b8b791c8ca35bfbe1d14919cb4bff98a05e49399c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=staph+gram+positive+cocci+in+clusters PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/34077248812.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/35885829976.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nowewijelizat.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/59958490184.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be71896fdf4---96883688216.pdfIn PDF document text
    • http://baove24h.org/upload/files/rosepizilaribadaxig.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/talagalovejajaki.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d4b12e9a8a174f56077a3216226edb88/63910889523.pdfIn PDF document text
    • http://espokebar.com/uploads/files/buneretedalilowimiveze.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7a78f008---tapodujefojexolakej.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/77d7d45f9e18dcd93efd58ee0bd7d3be/70861830370.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/97110315968.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xawuj.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nuzoxumatuxuzujedufepajug.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/57977649219.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec5e33927---80545306789.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/38338958262.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/22067407482.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/7973046652.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/79878976986.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160702670b3245---gomukazaxipex.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/48735885820.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87b7ef07fc---migakaduxupe.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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16716 bytes
SHA-256: f277a1edd94d0f28d71eda709bf5100349c34ba67a4b6396dfec8ab25f9b6bee
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 11060 bytes
SHA-256: bc1a2e48a4079c8946b171006d7bbe369b4454274f897673a50c1403c0415fc3
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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