Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f4551f3f4a2f2e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 16:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6544ce65a1709cd258930873b036b84a SHA-1: d7728cb2976c4bd589f33a4eb50b34677c99fdb5 SHA-256: d3f4551f3f4a2f2e8441e9cd4227a135e1c3bfc2458e05645110b5d9a16eb0d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic firings indicate a pattern of linking to compromised CMS uploads and disposable hosting, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d1234573---7306003365.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d05315cd4---sodefuwolarolamaz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/77606468707.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/fimowojogirofobasoz.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cf11d0513aeb713a7bcd833d72fc9bea/vubigejipul.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/35043955397.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ebce3839---52068743984.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210805_0D0365F3C9740E2A.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/mosesutiji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bbc8ca135---15282777311.pdfIn PDF document text
    • http://mosjob.ru/images/file/99006350206.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1147ae92---kizolulininanoledodi.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/50412889491.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db22686d077---59297659254.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/34275524263.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/56628563371.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080771820918---mejolaveku.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/10251221018.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kubuxuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nace+codes+2019+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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 10612 bytes
SHA-256: 0c330978463cc199f745c955cb98f2d62ead0079ad157128925de4fdece8369c
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 17296 bytes
SHA-256: dfa3e47320c2a2ea1d1aaae6165614504b7a093b1bc135363555f704a2295ff8