Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f4976fb263af0e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 01:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de5a498afff5931628217575c2d81c97 SHA-1: 3ba90bdcd99397a25b8beb65ad207662b6a2d025 SHA-256: 23f4976fb263af0eabef79e95408be10919118f827df37facc81e9158bc2cd97
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely serves to redirect the user to one of the numerous malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • 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 https://amblamy.ee/upload/file/49569526938.pdf In PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/kevapuwivirajezozatapo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498ddac563---zegetikek.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/80680489988.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/nitotasejonotog.pdfIn PDF document text
    • http://riversedgefm.com/files/file/tibomunexawowowipi.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/zitebegubavokob.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k0gquouchvadrg156q2oqpovdq/jitobaxizegezuguletunawiw.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94cc0950c7---fepevebezikuvi.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/44080343319.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/236tj422replvv4l8jre49647d/71226846054.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fkn2lvj13itt570lu9djceculd/32052177853.pdfIn PDF document text
    • https://signika.pl/Upload/file/63595600344.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/35570738861.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/komerodisuwid.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16083b14d1a7a5---remobesidavijiwetafunam.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef4eb9bbb---152117757.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/89750913759.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fnj50j6cbcc7jjdts52tncfdua/zuwoxazotuvupuki.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/30444988713.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85123274382.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/sezotite.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/10e648179a647491ccc21fa0c4ec7c8d/jelafekomir.pdfIn PDF document text
    • http://acelybio.com/upload/files/24154999015.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e6f1737dc9482fb7fa2e20c491de5878/pefajafupu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1044a9c7---83112078186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ielts+reading+with+answers+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_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 10692 bytes
SHA-256: df180f4481ac79cb4d86b25dd8f3c48be54c58c6d591351124f6108dd8abeeed
font_01_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 16876 bytes
SHA-256: 33b8aa09d59a7bca60bd6a571ebd1e09004ef6a784b4bcc05e8a2fa7f7fee463
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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