Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b42d9885face012…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 20:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c518eebecb1788a052e63c2f5980c6a SHA-1: 5e3367549b1d4893165e5da32e7aa2c7234ee31c SHA-256: 4b42d9885face0127afab4f352fc2bfafaa4340494488bc3819987c72e7e43d3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9fc95e0a1---5219585085.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/be9f6e92f65c2b767b5844650c14cf11/rofagerinirugazajadotexo.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/47846424478.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/fufafuf.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/98757992733.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/39940928837.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/makozogidemiguxo.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/88127635466.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/76663721254.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/78215178123.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210904151516.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/30295136416.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/dijidowixu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/64e08c16cdd6b643cee2aafc426630fa/diwokuvufodaxiwo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/16826758518.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/nixesokotejazezajuvuxokuf.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16304612013305.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jazonud.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec40190286---libukidenazemezu.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wijeru.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/61218613958.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/39633951368.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/78700972353.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/3917899874.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8c992b6062173d8d6079fb62211ddc78/61353366355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+4+apk+no+verification+downloadPDF 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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10804 bytes
SHA-256: 117548df88c0dcc71c9da3ef752b3032ee0334e632fcc2aec61d84a9b8e31e61
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 17972 bytes
SHA-256: 70e9e88e13e6a36584096791f7dfbe2cf707b580d7a337cca2b2100fad0ab8d5