Malicious PDF — malware analysis report

Static analysis result for SHA-256 5895989a88f5c1f4…

MALICIOUS

PDF

82.6 KB Created: 2021-06-27 05:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 194d7db820b697421fced5aedfaacf1a SHA-1: 4a02435e5e59d22d7991630a1da1773a68bee533 SHA-256: 5895989a88f5c1f4c8416726b42638666c660386585f041f6947a0dbde6d44e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://inwebjor.ru/uplcv?utm_term=les+miserables+study+questions+and+answers
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cb9e877---tosivafogisivefemijurutu.pdf
    • http://youngshiny.com/userfiles/file/1621264500.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a38b01bc7---52226414672.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4921c33b6---50578858118.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/840237bb5510e009f914ac36e4df63c2/pibugilajinage.pdf
    • http://akcjonariusz.com/UserFiles/file/dipuxiperil.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79cdb72252---79011879759.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90e041f5b---famokaxotusu.pdf
    • https://foodphotoshop.com/userfiles/files/32155954880.pdf
    • http://aj-logistics.com/stock/userfiles/file/65718104591.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/65490307092.pdf
    • http://aldara-latinoamerica.com/userfiles/file/60805029184.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7972272b---12411525370.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43cec32c6d---74113988997.pdf
    • http://smepil.com/ckeditor/userfiles/files/60054020183.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/bulobulutiroponopew.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/931b00d8e7c2da526c0b448e55476cd6/36739759879.pdf
    • http://piemonteforyou.it/userfiles/file/88376761415.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d31eb48d7ef2d95d90911ca834a208da/fewubuduwivuvipav.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8aef19d63c44792d5070c74960cd2f98/somozavofologinaw.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7620f6e6a896ca13fb285f3bcdbcdbbe/53534332691.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160754e84542e6---16701510546.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/momexirudewiruzegoboza.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_off0000dfe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16792 bytes
font_01_sfnt_off0000f7f3.bin
8deb306d957d000ac93fbc1b4ec193ddbe7971b45d7da869db3f9992c50b5ca2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17200 bytes
font_02_sfnt_off000123c0.bin
1ac0aabf31def5b29d78c5491cf36c5edf9ba2ebd8462628ad89de551c3a6d98
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 10952 bytes