Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed8634215564309…

MALICIOUS

PDF

81.7 KB Created: 2021-08-09 13:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31d83452bcfb345195110f2b0a628363 SHA-1: fbb9f3c8b125a3fdebdb4c6aef5049fb5eb19296 SHA-256: 9ed86342155643095dbae3ad27b61a5181da6239c2a01af4468a3854551c3aa7
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 exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc3681fc9---zibubelo.pdf In PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/buxuleleneralujeraxane.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf1e521f26---mupomopujag.pdfIn PDF document text
    • http://peak-experience-japan.com/vexorupazakujalejezodifo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/95012282482.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210808_E01030EBDD88380A.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30515371604.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/69754788310.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vasevexulukaxezemerizik.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed6ef0f16---nogatukak.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vigexixemofizagipepazisaj.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3e5a04fa---777624075.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/77743976543.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/faluramozuraz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c582b14c7b9---75636075489.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/75677480793.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/gozikofadojekovabobe.pdfIn PDF document text
    • http://gabortech.com/admin/file/14133655604.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sofifinowefaduzokovazidab.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xaturubuvogidox.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29956c02ed---bizekuvaritolalifigufudut.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c2a6531f11a48749b87083e6b5192fa0/59564788735.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb1a1110f---xowepajomubisaboxibumu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/972865431.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/fuvoxowexubegaxebezazite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=actividades+didacticas+de+multiplicacion+para+imprimirPDF 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 18016 bytes
SHA-256: 1f8847b661a7a680b89705448e168a4e76e5e9eb14717b167824ba7a423988fc
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10824 bytes
SHA-256: e6a60925cd600c68876fca7e8853d65919f4b65fa4e6b53332f7dca48b8d4df2

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