Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e8b85cebb38c0f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 16:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2ebe7247c0b76251bf16b7464e56094 SHA-1: 455950c387674715f5f5d52736bc2fab6cd574f7 SHA-256: 51e8b85cebb38c0f4cf4386a93580f11c140f0d7b7e9f951bde44f519c0c8764
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to lure users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://podhoru.cz/userfiles/file/razar.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/66431992728.pdf
    • https://dacola.com/upload/files/14891309059.pdf
    • http://www.rannatennis.ee/data/upfiles/files/51418489342.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_978BE8658D2A1591.pdf
    • http://bassbasement.org/userfiles/file/baliwubi.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/56619847146.pdf
    • http://sonarkella.com/userfiles/file/matemebu.pdf
    • http://morard-mcf.fr/data/Files/64797236135.pdf
    • http://hflchw.com/upload/file/64668559111.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/94b70710b72729092dc62d00a46313fd/11705654450.pdf
    • http://yilbasipromosyonu.com/userfiles/file/tapisujunanizixidesirap.pdf
    • https://www.karelo.com/uploads/File/83769613397.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97e09298d---62989423346.pdf
    • https://strefaokazji.pl/uploaded/file/posisobisoradonapa.pdf
    • http://capthepcongtrinh.com/uploads/news/files/sabinolivadadar.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/zopiwaxakobosisexunabis.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rozomexawuxetawofawuna.pdf
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/86546404209.pdf
    • http://fantasymusic.it/userfiles/files/pokeja.pdf
    • https://iwanbim.iwan.co/userfiles/files/kikigidudikatibejifono.pdf
    • http://primaria-ciocirlia.ro/media/file/91129740886.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k35hpa2jo46qi659hg8qs3nh1g/37420494732.pdf
    • http://cameragiaminh.com/upload/files/17020119730.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=traffic+rider+moto+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000b359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 16792 bytes
font_01_sfnt_off0000cb70.bin
d3d679b3a53bb2b1840f21f6f44e02ec05114b3da860cc8b4d7246c737b56343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 10516 bytes
font_02_sfnt_off0000e36e.bin
5487e9d25135877bda111fd74a8f5e20ffbaf1d786ba74e11183e32c2c179150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 17988 bytes

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