Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ce53b119e70367…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 08:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2fa810b9794e7aebc255ad2aaf6445c SHA-1: a6ca351c49ee44093b781c088473e8432b0b1abd SHA-256: b8ce53b119e703672660f5fc9264e3ab6727ca92529650d95d733a56074a943e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. Multiple heuristics indicate the presence of malicious links and compromised hosting, suggesting the PDF is part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floridainvestment.cz/files/file/xubevix.pdf In PDF document text
    • http://scamps.biz/userfiles/file/fekeb.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/72726437682.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/genasijuko.pdfIn PDF document text
    • http://platcometals.com/images/file/71144040151.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0c71f5e2---29239672002.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/tusepetowoxiruzo.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/kigerogezer.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/62dec2e2a25b2ea552f50ae8d3ad73c7/gudusuxinuxetiwufugudike.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rulogabunekenedaxa.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/wakovubidojaminudotuxiwi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b126c90e260bf3be7bce5a4708324520/sasapakefanuk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f98466d0aa---77942830341.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dcd480c7---90752780085.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/livazudewejixisam.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nudofuzovegefuraxosupepo.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/37439998539.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899786a4583---jurowazenule.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/bonorewuvamipakegad.pdfIn PDF document text
    • https://coluer.ir/documents/file/5953711384.pdfIn PDF document text
    • http://iknow.pl/files/file/41234459366.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/82090166682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tabela+momento+de+inercia+pdfPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 20768 bytes
SHA-256: f34289238347754a491fcdd60f0f3bd7356c356890681a9a9693380ddde86e70
font_02_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 10716 bytes
SHA-256: 46b3523a2762a9ed43f2652c7fe8b395d8a1aa71163561e05ff60154eaa5ffbb

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