Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f75f65009babfee…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 784f7a43da7d251577017e828f7eced5 SHA-1: e4c7f16a66bbf348a5a04009e613069fae9f0f79 SHA-256: 8f75f65009babfeec8d48a21d272965477884926bc79edf029318e71f3d5d823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted from this sample, but the structure and URLs are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=show+bluetooth+battery+percentage+android PDF link annotation
    • http://polesprogettazioni.com/userfiles/files/82068984382.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/nodaze.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/24004062863.pdfIn PDF document text
    • https://atlantidegattico.it/file/fafizagupagomagi.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/66662318811.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9afc4241---sokopoxosemid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb225acec0---puvuxuli.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/90639263758.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pinokosufujowiwalamega.pdfIn PDF document text
    • https://buka.ru/sadm_files/4374978775.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdfIn PDF document text
    • https://unaizahic.com/Files/files/35493872300.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xejalemesitirofuzemotat.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kurovevujodokegakotal.pdfIn PDF document text
    • https://renteci.com/imagens/file/fuxifumoveribavejewavot.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58223668792.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/8095330916.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kikukonoluloxibamepemozu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6370e5623---90165845538.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/jalib.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/64097012493.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0590e802d---wajodivepuguzi.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/95974938732.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/32314182019.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 18484 bytes
SHA-256: f79257c6f5f0cd65b86392bae0d00d0348ed0832f5c4279dc585403f9eb09b2f
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 11140 bytes
SHA-256: fe3d0ad493aeb5c279d16e6120bdb53c7501b7a6e511a1e969127541b603d6c1
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1