Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa1c4bbf907b5d7…

MALICIOUS

PDF

64.0 KB Created: 2021-09-30 12:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 152b47610c17a0ae60ce88de43b819dd SHA-1: 7550f8bf8d50ab27dd691802c7a8987f7f0c752b SHA-256: 2aa1c4bbf907b5d70dcec0f7e1d16f873cf1e31a8897ae1e337e78aa54c7877f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=my+apps+time+apk, are likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 5

  • 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 https://nomylo.ru/uplcv?utm_term=my+apps+time+apk
    • https://studybrilliant.online/app/webroot/img/userfiles/file/39666347319.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/miwunakesexejusinexo.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/52552924937.pdf
    • http://rocb-ap.org/file_media/file_image/file/19141500554.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f2460ede---69479610038.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210907_601BF4AD83EF3DA0.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6362905ae---13820196663.pdf
    • http://barbusci.it/maisUserFile/file/87209038000.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/45818888034.pdf
    • https://maviet.vn/upload/files/55705450813.pdf
    • https://mimpidia.com/contents/files/vonirepebav.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/24380784044.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwunozasesutorufuvuwu.pdf
    • http://a2hgghk.handylover.com/upload/files/45952759638.pdf
    • http://liccuza.ro/stiri_files/file/60785570439.pdf
    • https://cepatdaftargroup2.com/contents/files/fagekopubipe.pdf
    • http://poltinka.ru/userfiles/file/49582406292.pdf
    • https://kuzeyilac.com/resimler/files/51247476589.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/46179426870.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459237a45a5---jisisifimaxikibevikifewe.pdf
    • http://krakow4you.pl/krakow/files/wapinufapakajuzomutinow.pdf
    • http://decorstore.eu/upload/file/73056370859.pdf
    • http://hongshengfish.com/uploadfiles/20210924/210924012332692815ibbe9pd7nxkc.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 16792 bytes
font_01_sfnt_off0000c768.bin
50c4914cc9763466d57b4aa7192dadad3bb62d2aa1b3529d6018880088ec475c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 10244 bytes

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