Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5808b689e6cd805…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 11:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cab5c501f1d5246fbc165bfa3ff19b37 SHA-1: dcbc69e234b230b16babd12064f0176937e8f0f7 SHA-256: e5808b689e6cd805b6a55237eff7ceb8b0c18c77648371af83812cd5a05c63d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://urbanelect.com/userfiles/file/93906700894.pdf In PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/jifuzisedegiwato.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/34302075159.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/19757799694.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/87292973034.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/tizutifodivogo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/toxufeseginudujo.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/palibev.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/rovupowugetus.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47778469889.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kajaxafagixajivodewekuni.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9bd5b40b---79331677815.pdfIn PDF document text
    • https://btegypt.com/file/96692128089.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854972e4d---43527997257.pdfIn PDF document text
    • http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/43837231679.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/gujewupelerosatebelevixe.pdfIn PDF document text
    • https://krossi.ru/images/content/files/giferesebukafutemasudan.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/16077165105.pdfIn PDF document text
    • http://cecev.com/stockages/files/fufid.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/najovozonajaromupurebetut.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/pelatinalafurej.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613061b88c851---siweputukuduwofujetizezek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ram+geheugen+uitbreiden+androidPDF 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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16844 bytes
SHA-256: 5ac9c66191bc55909d7a140c0b7bd8ced528cd062d91d1a9eda55ba91c2a4a50
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10768 bytes
SHA-256: 4d2081cfd3b54a960fe96ca297d9582f97b2049e2acada4f685ebab212670437
font_02_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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