Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a670ee7dcac96e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48584098728691ef9098aea7dd50a0d0 SHA-1: 03c5b0f27e57f55b0aa43ef1bc52725e15cbb2da SHA-256: 33a670ee7dcac96ed16d58a6ff09cebadabfc11bfb70d187dd5e92b7494a6547
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised WordPress sites, likely serving as a lure to download unwanted or malicious software, as suggested by the 'utm_term' parameter in one of the URLs. No scripts were extracted, but the structure and URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131941130033---24936651826.pdf In PDF document text
    • http://plechotice.sk/tmp/file/dizulerimirogexijatotasat.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/74914331563.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6b2845ae2290c41c149558867dfc02d7/59569066824.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/86941962766.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/25848117193.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/978096408.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161423b61a5c8a---larapopan.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/71349843241.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5f94b58e72744366c47bd95594d47ed3/17295679879.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/776091302.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/21871490046.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xavofe.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210909_191425.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/20008816198.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kugiza.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/gevipapuwuruwutudufowu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/no3lh1furi3o7bvo40qfl4c4ad/digunux.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/12249107344.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/84483346063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+magic+tiles+3+mod+apkPDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 18056 bytes
SHA-256: b19e81cc049490bc6743a773b7736d38778183845320078621eaf08b9d5e015c
font_01_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 11108 bytes
SHA-256: 5d513e281a794f5a4341c014c08200dd6b13e50186b4ce805aeabf49e52eefa8
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1