Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8db2459854a999…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10964b1131962cc8e47929748a0f1f24 SHA-1: 86dd61a1ed2e4d78a10220fd318985bf119f3099 SHA-256: 1d8db2459854a99904a39c7d97361e8f866c6369b7b58db03a61fe6d82bec731
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 6

  • 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
  • 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://albarossa.jp/js/upload/files/79510756436.pdf
    • https://buonoantonio.it/userfiles/file/70184358125.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/zapefonukupemululub.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210916215327.pdf
    • https://larioenergy.net/uploads/file/31844367702.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614098ecb8d67---zixod.pdf
    • https://happycondo.leaddeehub.com/userfiles/files/96396969506.pdf
    • http://aptwash.com/userData/ebizro_board/file/puzumaxaxemoruru.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jl2vidpljpchai0rqjkc83m9v5/zefajalajurexozajaxat.pdf
    • https://corpusbg.com/files/fck/file/minakugalumadazotegow.pdf
    • https://gancza-yacht.pl/userfiles/file/fetimi.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7d271862---90034517589.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/zosobobezewamukego.pdf
    • https://lompatjauh.com/contents/files/62796027513.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdf
    • http://fulns.com/uploadfile/fckedit/file/1631897065kPS9.pdf
    • http://519pf.com/userfiles/files/45229198787.pdf
    • https://cplastik.com/data/cms/file/vozolozaxisipolewokugixis.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/mukopikidunasevo.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wepududesa.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/pelolo.pdf
    • http://metafelix.it/userfiles/files/55697133562.pdf
    • http://pro-group.ru/userfiles/file/bowafosiserojujoke.pdf
    • https://accounting789.com/ThImg/file/8728276580.pdf
    • http://makeyourpartnermelt.com/userfiles/file/fagetuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+4+android
    • 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_off0000f56c.bin
555130046b735b5fd04101ea4694c11ab3ac35d1902f9857c2abfecf4f88e1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10012 bytes
font_01_sfnt_off00010bc3.bin
34fa9e28d1be3654bfa1772a1c07f88f0f6d938488e3ef01cffa79cb0bf9c276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 17380 bytes

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