Malicious PDF — malware analysis report

Static analysis result for SHA-256 543e0b8084c656d8…

MALICIOUS

PDF

70.7 KB Created: 2021-07-31 08:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8db9378e205a6387dfe0b8b9c919596 SHA-1: ab74b6f83097c85133001c7721cdeaab6165e1cb SHA-256: 543e0b8084c656d83cd52fad9c5c174ac7346d5bcafa9725ba96f3d47da69f55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the primary function of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9290

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crewmak.ru/uplcv?utm_term=how+to+hack+brawl+stars+2021
    • https://nabijdefossa.nl/upload/files/kasatusovuxixawi.pdf
    • http://skrabl.pl/www/rpbd/fck/file/laxakaf.pdf
    • http://abwingsde.com/uploads/files/48654237967.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/55368259592.pdf
    • http://cdmvt.cz/sites/default/files/66855506657.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/vataxugorovotewaridefon.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/92efb380f74039948f15e1968c7aaebf/83907899214.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/wikirizarefiwefotofalibow.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c329c799b---60713724361.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/juvijodukukimi.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ae21c1cc77f1390910eb2195cf5abc4a/63668396871.pdf
    • http://russkiivopros.com/images/FCKeditor/file/89601414226.pdf
    • http://chineseclothingonline.net/File/68974618930.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6nuue6lvofuilie3b8t7rhji05/49569989236.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16080616a16ad7---ledokuwamexari.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3b9c8d8717731063f7a044a4b7fb6f1/ditufumivewirikuvebipogo.pdf
    • http://ihvanturizm.com/rsm/files/letedoremowufezurug.pdf
    • http://probeg2000.ru/files/userfiles/files/51766588506.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac847a7da54---nobaritiwotiviguvagugubiv.pdf
    • http://kirsanov-maslo.ru/uploads/lupemilukopisuj.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9cd11286f67f9a9b093cd3c3b54d32e1/58716517124.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/nogudeboxanowatanosaki.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 16792 bytes

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