Malicious PDF — malware analysis report

Static analysis result for SHA-256 912bfc81bac855a4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 14:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40d02d602c5845074f8d738316bfd1b4 SHA-1: d34a4f482436a73bad1d45975cf1a9ffb36aed7d SHA-256: 912bfc81bac855a4e2a17fc6aa5525d6e952a62ab458a8a37b06c1b5f36a7590
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to improve search engine rankings. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=how+to+get+video+wallpaper+on+android PDF link annotation
    • https://omprintandpack.com/userfiles/file/50966925557.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/jediwo.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/xizifusumidajamepa.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/49257445961.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614141f5844fe---66745367307.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210908072807184.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3544e981a279b7f7dc1f1868a5264239/mevukivubowidi.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109170151594019.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51700893108.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/59805441066.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/babapanazipozodofij.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/zesowerovujib.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s0q3tjnb9ph4hecng05oamlp25/59772966325.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902170218.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/jemilazezev.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zazaxowelowarukurot.pdfIn PDF document text
    • http://okun.su/upload/file/93706654518.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/sukudadisow.pdfIn PDF document text
    • http://esistore.com/userfiles/file/salese.pdfIn PDF document text
    • http://metabolit.ru/files/file/47070266321.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n7el14r0jajdillmb2mo1s8d01/82366969881.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/ragafaxuposifeke.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/pidisomu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 18044 bytes
SHA-256: a4c666d82d2986fa0b957927e913d7a9532d02feea1e60594b8f52e8e3a7d070
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10544 bytes
SHA-256: 322e183b68df4e53049788ada55fdb43d4b8f4ce0430a2dbb2aa41eb8afca500
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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