Malicious PDF — malware analysis report

Static analysis result for SHA-256 5755e327acadc9aa…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 15:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830fa3717e46ea9d1d143c7247e6bfa3 SHA-1: 701da87be3448544747dc588edd6ac397923d659 SHA-256: 5755e327acadc9aa8c74afdf35aa4211af8614afe5765f82af0974a1fa2b9b7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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
  • 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 https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f86142e62fd3681edb08b7fba18d7608/kezaloderasuvarafifuwes.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd2904fd3---75251339064.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866fe2fd49---81043964761.pdf
    • http://barnesfamilyre-union.com/clients/52050/File/93796219182.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e9b5f822---lewumotadorigonuluxaxixu.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9af43e2f67531b6ba504c625cab375a9/vudikozozejulanu.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/jososodifekufumudugow.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c10842d12---patelapeposabonelo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071d122beba4---rerodesanakotazom.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7ac71bf---71324656472.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/51745760682.pdf
    • http://studiodabo.eu/userfiles/files/88484663587.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uds21j179tnbfr3l59t9jtbm7d/34728987681.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c26d7f06748---nukukefikitapusomexidab.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/domuwipabelupuxoxogora.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/guzamibamowepuzaninasuzin.pdf
    • http://rapabzenec.cz/obrazky/files/xofeperibijibiruravepasi.pdf
    • http://sevimticaret.net/userfiles/file/fizeki.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8jsuqipnglair047vmdiv568s6/kizawelozizalododabedux.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607114c8007b1---rinogudatanitofetumutufi.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078fae3e7509---mebifi.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fo9igb87187ngi29ehn5ufj562/kamupenawixuzozusol.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mavufurexosu.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/47ee410978c5366408766abe63eda26f/69497058762.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=martin+luther+king+civil+rights+quotes
    • 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_off0000f017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 16792 bytes
font_01_sfnt_off00010829.bin
485a50980f42b9b9972066e3c9cffd34f7e55d10e290c17a77884ec0eeb341bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 16840 bytes
font_02_sfnt_off000133b9.bin
9bcc4be98f05dc1ba7292dad018a25b33911659a087e836fe1ea8858a3389cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 10904 bytes