Malicious PDF — malware analysis report

Static analysis result for SHA-256 4399f9e922cda24e…

MALICIOUS

PDF

77.9 KB Created: 2021-08-19 02:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11f9e6badc913290a49c35c4b5463689 SHA-1: 00ab1d7ab64c70e04671f5d59c6ff57e0007c787 SHA-256: 4399f9e922cda24ecdc628358e8b1291dc83b29b97d7d1e2f6498e9d115cc387
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9093

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 https://pistant.ru/uplcv?utm_term=dasavatharam+telugu+movie+mp4+video+songs+free+download
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c716c334667---fikugiwasurusefe.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2e7f056b44890a3e81c721e4bbf19411/87240079223.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fe93a157612---52172007942.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e3054d2a---17100729994.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e8ec24fa---fibinebinojiwobaxa.pdf
    • http://scriptonica.ru/files/files/92610300849.pdf
    • https://fenixfalt.com/userfiles/file/78920943882.pdf
    • http://immobilieninvestors.com/userfiles/file/13740107073.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/rowamowa.pdf
    • http://dermalab.pl/userfiles/file/suzitoxorijov.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/48157497348.pdf
    • http://open.ua/uploads/ckeditor/files/7237770555.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c13ae1e8a---venovux.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ccedkb88u6qt7vufovq4rpflf3/68472259156.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/75197294324.pdf
    • http://atol-res.pl/uploads/file/peserama.pdf
    • https://panama4d.com/contents//files/55221338418.pdf
    • https://ikima.fr/uploads/file/fokovadisuditurisi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982762b9b48---43486123297.pdf
    • http://farmaciacogliate.it/userfiles/files/xazenigojalewufu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d2.bin
273dfa21b16355d981652a59066c693bb863e7f9a8677b637c99632e54ccb23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 11276 bytes
font_01_sfnt_off0000f403.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
font_02_sfnt_off00010c15.bin
d94635160dc92426f975fd558e62cb1d3e43ee92f448793ba20d69cc12208dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 17356 bytes

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