Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffab7f12fb1016f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 04:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3cfae0531a8236f2df8181cf53c4845 SHA-1: 22ff9c294a87e4bed3a4f199a13bef099f29720a SHA-256: 4ffab7f12fb1016f8eedd70b97a70c27bf196b339863ed968820bbc296c5d0cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure itself appears to be a link farm, leveraging compromised WordPress uploads and disposable hosting to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2iiu022qln57kg80fjbjavd2rc/tuxasujenozowatuzet.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116b4ff09ac0---31012208555.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/3898248777.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893c241abb---towiwatidugutikoxi.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/zorudag.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/mukevubitekagopafuse.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/revuxetapejakupiteni.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/pepox.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/20606cee0e989990018aa2a43d189c94/teban.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c44cf94e811---setogajibovadop.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/gutawarabibujuf.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/72442996529.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a217ca4e---kobokutow.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/271e88a84603be5b6611d5eb018771bf/zodelipinorupitoxob.pdfIn PDF document text
    • https://longhoang.vn/upload/files/78169749104.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f080330e88f---melarajewidafawufos.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/44932260997.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/65742224642.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/tumukijofofo.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/wagazo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/89038206602.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/30063217541.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/vemafuzavi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede47ee1e8---34637245920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=smith+chart+image+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_off0000c095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC095 18292 bytes
SHA-256: d18ab6bb58c86d630b54065ceab4ba697696ea063756a0bf6f398b4b4185468b
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10704 bytes
SHA-256: 19755380ddf99da9a3ef7a985e6d4a3a3d72fe4d20681f5701eb90b66a4bc74a
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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