Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9250166be5e71fc…

MALICIOUS

PDF

51.8 KB Created: 2021-09-05 19:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4104d825d5aa39d198477d4e78941964 SHA-1: 2b42c2eed607722bbf7172871690c7b66d868ee9 SHA-256: e9250166be5e71fc7d13df0d309547c2f9212f86392e9d25c4fabaf86a847f1e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6215

Heuristics 6

  • 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.
  • 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
  • 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://phdpecs.hu/userfiles/files/pixijuvalazotuniva.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/1247323999.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/ginoje.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a49e171f3---47680306369.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/jorunisam.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607729a0d0b40---86764979461.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9370ff50---5781486612.pdfIn PDF document text
    • http://robertbah.si/files/file/42158599127.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619061030_yoph4z.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a6f55a931fb999bed8071e8b2c432c86/58376063119.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/7999699010.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/potiwozop.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/68457566080.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/2462794486.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc93fd04991---jotifelaxox.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/21715977252.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/40866669643.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/tipoz.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/75855786369.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/mapanerexirezidi.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/ratavape.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/74034234751.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sikawegekixaz.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/41960753124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+hidden+life+of+trees+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ba85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA85 15239 bytes
SHA-256: 300d0f06a2b9abce3191c8f1b119b3c331a003ee6377bbf7e462357519fe6da2

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