Malicious PDF — malware analysis report

Static analysis result for SHA-256 e433f3bad94618ce…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 01:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1df9c23fe50454ce353becce2b4d7fb2 SHA-1: 1bab7b38a55cd3eb671feb0e03324068e0efb176 SHA-256: e433f3bad94618ce298372a6363fd72b0f64c5934b5a1814ff6808295cb9c9fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.scmsgroup.org/ckfinder/userfiles/files/sebegakad.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vijejiwakagerofa.pdfIn PDF document text
    • https://baongochoa.com/upload/file/35161921217.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f64dc0ef966af2f29ed668e01909e1d/kasovafufozemaxuzepoki.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910211155.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/bavewo.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/60286370489.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/lisijanifeban.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155f43fa2559---90776298092.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/99011014707.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/nibalejan.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/87249417210.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/gaverurexi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/92077937468.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d0a966dc---kuwugota.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329064a6f08---kedofofujogumenoletelovi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4199dac754f03630aa99e74c9b13e59c/37806694072.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/sebiwenudutekamuwidajos.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615056331d7e4---19612764122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=car+racing+games+apps+free+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_off0000abdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDF 10984 bytes
SHA-256: 7d96b2c7f28830b5b8137375fbfd6b1fce55a8fc15e8cf601a396b8ff6ade0f7
font_01_sfnt_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 15316 bytes
SHA-256: 43e7b181c67492140341d06a6da21f2c16acdeb12bdf4413062f995fee526c8c
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1