Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef06167eaa9bacbc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 23:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62c04a07d12c154493e01bb8699796df SHA-1: c112dabaa5a888f9a80edeb5baa2f046cdbe16c5 SHA-256: ef06167eaa9bacbca881136c1e9ab502fc3971e5641f91a4073f7b77aee9b9c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef407a5c31---wuwibuxefepibowalefu.pdf In PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/7483203976134a11fb07a5.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/97408445090.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e8b8bc96f2d571a965c432f896d9ad78/42463595559.pdfIn PDF document text
    • http://bomando.bomsolar.com/uploadfiles/files/86524628241.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/mumulegem.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/76151026896.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/94120293931.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0snl9v10kbs3tn74vo7n15cb5n/vagew.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/34734183662.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/laduvezelipe.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fikonofuvob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j96uundg7vm2evuqatacnfqc67/14785121739.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kewol.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/mumebinebalofugalelu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d62b8128a9e753b8003d0b8d366d6b25/pitatul.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/94998287392.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/42547977742.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/78017898105.pdfIn PDF document text
    • https://aedwea.com/upload/foto/najomivewar.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/16044163421.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d399f3896c2bdacf89342aaf46882e5b/repezeg.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/38124681775.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dogafemoxuler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gx+loader+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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10112 bytes
SHA-256: 0e788ca01bee7c6397662f60c5cee7be6650c4e9778f4494ee22e0826550f0f9
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 18372 bytes
SHA-256: 5e22424a42b5d9e8340d593ac20e3c570b792f5dbdc2cecc84ac6b85cb268fd1

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