Malicious PDF — malware analysis report

Static analysis result for SHA-256 890832b6b9178922…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 19:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 524d7e5ddbf6509eb507268ddbf18da1 SHA-1: 9fb956840bbb6f063a3e77958f1e8f684b75c95a SHA-256: 890832b6b91789224951cacdb0eb5cb50dd96553206104d402628dfbb221457c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, indicating potential for malicious execution. The document also functions as a link farm, pointing to numerous external URLs hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites or for SEO manipulation. The presence of embedded JavaScript and the nature of the external links strongly suggest an intent to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bursakaynak.net/userfiles/file/62265497694.pdf In PDF document text
    • http://nissanotogovap.com/uploads/images/files/zezolibuxiwatiluxibik.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210515/file/37371602802.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4e5902c5---tovubemoxarovutufuwu.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/jamikobasiwek.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/53357949902.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/8303305485.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/4857920452.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/rukoruf.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b0cae97---fojavasikil.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d07e59bd58265a930d1757f81ebdea3b/petomuxesijorudivanup.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba69e36d80---66645572055.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1ce37e481fe23596faff6429c4ae1fe5/podatofepexol.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/db418090c0201fcc429d09123cad717a/53768131258.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/14678580195.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609899b254af6---93835034858.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/escs8l6ukveapup9m7m5jb13nd/xetigipojade.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wasidadagilizofiguv.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d7ea47c50bf8fcee53ae8b9325b4df20/waliso.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7c749618---19150500408.pdfIn PDF document text
    • https://digireg.pl/upload/lepogudiwapigefozuwuj.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/jobowux.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ee1353dbf8a6923c2046ff5e32581f88/rezajekodok.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/nomopizozolanatesin.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tezutoramemavezu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7458f84896e19d4f33d909262052dd40/berexiwafavupeguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hacked+coc+gamePDF 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_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10188 bytes
SHA-256: bd96bd0540ff9a8484ab3f97f93623cca69db238f68e37eb8649c42c1a8830aa
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 16892 bytes
SHA-256: 8ce9f9cb5992084f339a3b5648e1936aeaa0291d606286fbd3585be6721ddd3c
font_02_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1