Malicious PDF — malware analysis report

Static analysis result for SHA-256 2899f9c99df3b0f3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 05:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c487ae12602f695e62982206988263f SHA-1: 16b268cec279e88c0862a1f1247a10390fa73d92 SHA-256: 2899f9c99df3b0f32f052dab1d8c4855b5143bd492d80f79c0a4a16ebd671bb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lightningriskassessment.com/ci/userfiles/files/67089572933.pdf In PDF document text
    • http://csc025.com/userfiles/file/20210808203644_orz1h5.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dea5hsaa97o6tn9f22m14v3hi6/81763329428.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/171b89c63d640498040707436f3eac49/duvinamazaluginerivuxikun.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c2067a63---mogesodenarobitejeboreda.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d844cf8437eed590ecf89ab6071683e/lemosaguxudemesaponanen.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/46452165158.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/dafefomowofadukebe.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vevobokutedutuj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e10af5c889dc54767b91391660b2b072/16866698447.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/5587143989.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/63323397007.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/290f06b3b72a9695eb9bc1e5132f9bf1/2379069423.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/55148891460.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/51879872071.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fazusikenakuxagepubu.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/64389917007.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3ed3985a34672efd06da52ba68df25cb/kuxaxaruwatipu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210812/0913199889.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f1d0e0d9---tepotisarazubiz.pdfIn PDF document text
    • http://01host.ru/userfiles/files/22024697386.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/lijenogugusinuwuzemetul.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/28821354349.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/33323383198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=current+assets+and+fixed+assetsPDF 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_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 10416 bytes
SHA-256: eb3d18fe8a59b48cf8b531926caaec15d04b91209805e067bc1e68422e13ba30
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 17516 bytes
SHA-256: 3947b349d8e1e3eee8327506ff1e2d86d8ffde888e6a2cacbc97d31d8aef2174