Malicious PDF — malware analysis report

Static analysis result for SHA-256 def0edf274569792…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 855953237e175542341a97169bb9669c SHA-1: acd0836b86633250e35d0d2e050a0b04322246b6 SHA-256: def0edf274569792f073a0ff80b2386cdf61081d845a55fc8c2c8e42ac175b16
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content, likely leveraging embedded JavaScript or other PDF-specific exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://childrencareandliteracysociety.org/userfiles/files/35351656590.pdf In PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/mudonoxigozuwururi.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb821b09f9---motibo.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ad220108dae67dce9c5c7ecf88c7a9bf/52833356430.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/25182856424.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613574661a62f---pawefezilidi.pdfIn PDF document text
    • https://renteci.com/imagens/file/11658792999.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wumikizosi.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kunisalegimagelogazebojur.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/desozekufizubivetub.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/bepewuwekavutewivivotug.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/28890109610.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/36a91ccdef36f2cc022225e61973257e/vipedurer.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/fixafeb.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zidaxifosonilewutupenak.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/57114931682.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/11990835976.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/52019629193.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/42086191233.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/31599516824.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef41a286e0---62959230435.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/rarujizifasazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=verbs+starting+from+nPDF 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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 18240 bytes
SHA-256: e3e099cb5c0f750339a3492b8847d061b7b3ae9abc3b8a834f42f6ee39d8eedb
font_01_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 10620 bytes
SHA-256: d58291436ddcaa2a2b9544c731f0a24a3cb93fad7b9c01d5f54bc92f3b0cf5c1

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