Malicious PDF — malware analysis report

Static analysis result for SHA-256 deabf6c415208226…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 23:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3722788d4a48129fc2d19c997c9bf080 SHA-1: fe2715d49d8960d69b8367470d527a3de8c0af90 SHA-256: deabf6c415208226f13ad451bbae2de1ca21815a45594f5b3c86efba6744a867
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript likely redirects the user to one of the numerous URLs found in the document, which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://edcasys.com/ci/userfiles/files/61180848638.pdf In PDF document text
    • http://villabrown.it/userfiles/files/lategomubuwejupewima.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/buvatudekati.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075e97bee3d6---zegikunewuzofukuj.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/21983923676.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/on9bsv36pvpibjab42a4h9egf4/789450462.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/xedumafap.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b589c8e626---74091493988.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a497dc3c6---xiduxavuzexo.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/35996247064.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaf14486e---fobelegemofute.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/jinawupaxatuwegiduvir.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zavogarotizazepi.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/novovalobosejo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mivex.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/36950555219.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wugobuwa.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/61332973293.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/sebizebalipidavij.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/700c0512387e6a308f08726bf6bc28d0/tedilemoget.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/87c66082d270e02c31c2f69c4c1bd16c/dadolun.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/35282834008.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65d9dd4ad---degusekavewutuzel.pdfIn PDF document text
    • http://autovoda.ru/upload/files/dekatogedesibolifa.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160823e0a816e9---xapizotixikokesawifevot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=civil+engineering+design+projects+for+final+year+students+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_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 11236 bytes
SHA-256: 0600e5469cd1d9c4c7169c5bef60f256680e6d61b6d67eff40f9fa5a35c0ab3c
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 17200 bytes
SHA-256: 35c969c6238de33540d1e76e4fff0c7a10f40b528a6b83b3678a344d7a020428

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