Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa037b290e5a9967…

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 22:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eb9404876d3e1c00672efe42c2cd34b SHA-1: 76a343542c7128f43a0b4e6c0d3d10cbeaa0d189 SHA-256: aa037b290e5a99679406044809c6af8d97f548c47a850927754a7f4a64866858
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, and the presence of external URIs further supports a malicious intent, likely to download a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8891

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 http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987111eb049---kuvebiwafelek.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a122ccdfd0a---miluzaz.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/s010l63d9onr9arias237s0bm7/torubaxuneki.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xabakebotizutuzixugigojid.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f58c99ed6---64598461684.pdf
    • http://baldonimarcostudio.eu/userfiles/files/bapiwu.pdf
    • http://galettedesrois.hu/userfiles/file/55414855071.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84458034292.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610e39ca2719a---bepojiwepetok.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8nc6id7sv6vuocre3bamu31s3s/moguj.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d9e033dd8---32828741596.pdf
    • http://bluecars.pl/userfiles/file/xenepimup.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/3026245826.pdf
    • https://smilaxlabs.com/userfiles/files/78967275621.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/vivaxa.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwerosafatajopozotum.pdf
    • http://www.asslar.de/downloads/38317470404.pdf
    • https://travelstore.tn/userfiles/file/84686308654.pdf
    • https://hinodanang.com/uploads/image/files/bodutabadufumegivonev.pdf
    • http://giadinhmedia.com/uploads/files/werovasupesusotelunes.pdf
    • https://prospr.fr/ckfinder/userfiles/files/pijodonubibazatagifez.pdf
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/sogew.pdf
    • http://ysenb.kr/board/file/editor/file/dagobirakurupinu.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611592eb3956d---74561410727.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/kowavekozi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cuaderno+de+trabajo+de+matem%C3%A1ticas+5+resuelto+todo+2021
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes

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