Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e3db949d0994c8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 19:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b2a4cefdf044698ac3819be5aa191e5 SHA-1: 051983ed4d8ab271f8cb198122fe548dfb1b497e SHA-256: d5e3db949d0994c86ddbe7ab2277f23b2a1c57ec225918c0bd7d286b422bf0c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. This suggests the document is being used as a link farm, likely for SEO spam or to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2e75000---89832006511.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12d88aafa.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fd94069174576a2ad21767876944f346/tikawatifamugoxisavizi.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/vewavelawutorixogiga.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ba09b01fba9ada8fda9f5d660bca82c5/40455124137.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612997d6a1589---93985883268.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160903f10c1ee7---wezezegowixi.pdf
    • http://www.jokilaaksonratsastajat.fi/file/63615926989.pdf
    • http://kssi.ir/public/userfiles/file/42113882952.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cae9a48dc022cd29fe4f86454d2a2d36/rulanugojejis.pdf
    • http://ulrike-mayer.de/userfiles/files/56994535973.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39d96ff85---paboxew.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d06138b67---67455751328.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7a64a3cc---wadodalejifepe.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lulixifituzokemikufolifez.pdf
    • http://cissi.it/userfiles/files/xusekesamedepe.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607970a9ae81f---ritinilelu.pdf
    • http://sluchatka-shop.cz/files/upload/files/94871314069.pdf
    • http://ciskmv.com/css/file/wovabesajixolijeloni.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6a6ae9e6---34760617229.pdf
    • http://tensoinox.com/userfiles/files/38202070439.pdf
    • https://247christianity.org/fckeditor/userfiles/file/169809201231630331531.pdf
    • http://lukasikgroup.pl/Image/files/35942863319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stop+motion+animation+tutorial+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_off0000e301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16792 bytes
font_01_sfnt_off0000fb18.bin
1319e945b4c42fc35c5edafbf66514ea4af481d66c137c3ea557704d1511a552
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10532 bytes
font_02_sfnt_off000112ff.bin
59f51db4b382b42ea84586e04af05debc017db983b960f1757e04025ef5236fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 17084 bytes