Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63a9ad517a285c2…

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 23:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951ddf750da61ce534c37c90aa011258 SHA-1: 022e3496f2e21e318c19d3655833a3125dde9d57 SHA-256: c63a9ad517a285c2b3f4932db093e3b6b96f91818b1145ff2647f8c0e4b20355
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised CMS uploads suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crmrealty360degree.in/userfiles/file/zafalosigewifapid.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff506326fc---27516678152.pdf
    • http://thongthien.vn/upload/files/fuxuwapebalogezilate.pdf
    • http://baigeleather.com/userfiles/file/14230462456.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b690d4b592075680ddc12f66dc8ed14/gakovenafoji.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/of113mtb3tdrd58md2pgoc3u5m/41860748758.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a148267e58b696e3708c7e5d8d5ec19d/2474462950.pdf
    • http://bet-balance.com/userfiles/file/boluf.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd2a11d82---moresi.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0qtgnprnehbsg2eq0a0b06h1ah/95493296183.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/88424501189.pdf
    • http://wib24-admin.de/uploads/file/varozib.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805251bb61f---gakexeminaxevokobaxatadab.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/99090212708.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b8519b87d2a98299be704ca096498821/pafoxo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/65abgspkggsd2un9rr8m4dhem0/45233241208.pdf
    • http://akinmedical.com/uploads/file/pivamirij.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa505eba---tonewezarutivoloxovadenak.pdf
    • http://colescastle.com/clients/875019/File/74574038398.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b59046cb0---72062056778.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a92368c4dcc---nurivobogisazuxida.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889c7058772---25760062256.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=anti+rabies+vaccine+dose+in+child
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc126fae5---fenexigovogolikenufawiwiw.pdf
    • 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_off0000e1e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16792 bytes
font_01_sfnt_off0000f9fa.bin
2d269d9cf6587d8b06c2de085e1dc63f0256749d991016e37dd703a7a881fdf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16936 bytes
font_02_sfnt_off0001265f.bin
5434b481dda92c8fb3ef074d5e6f0cf73a63d3b0e57f70625df63d023fb9be01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 10652 bytes