Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd254b6eb693eb3b…

MALICIOUS

PDF

79.2 KB Created: 2021-07-18 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1690ccc3fd66d8b87d22feaa7d88fb92 SHA-1: af4d115e7db7cfbf86098a42dc45a1b885088bbd SHA-256: bd254b6eb693eb3b167d7b1d9a5e436835fbe24ce7fecfb2974260e551833b53
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users through a link farm to potentially malicious or phishing content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/bba0abedfebc497b4905279915a0d5f5/vupegulolirekojemo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06cc6a20a---44721348483.pdf
    • https://alakharia.com/public_html/userfiles/file/23639539856.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e4db6333---15275404507.pdf
    • http://techscreening.com/userfiles/files/49779977573.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760e99b4e5---xezodefurox.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/49da79258f532c418fde10c524679dfc/xosukovikilopezekewega.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/lulaka.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd01141df7---gebedipurupil.pdf
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/xunexax.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b066ca152e6---semeputox.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ki42rqkvnko9landbbs1eoe1mo/vuzimezififosipasi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde37b4f34---30244942298.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/64912643222.pdf
    • https://nabijdefossa.nl/upload/files/xuxewavexagogogijefevo.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370552c127---lekenemori.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c89be048f---11300323037.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607275d380309---bukuxijanat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+an+example+of+an+array+in+math
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 16792 bytes
font_01_sfnt_off0000e9f6.bin
395340c8ffe43c38db08ceca84fa996d4279522fe0bebb5a53f47151b96a179c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 17300 bytes
font_02_sfnt_off0001173f.bin
6e1f978ff42375107f0048e1b0d9c1e5799b56e6d788e2497718f7a1710b25e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 10832 bytes