Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56d72f4481fd737…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1cd125eaeeda02269d76842903d440e SHA-1: 8f861cdb9ffe67fbb400473a8709e9bc73e666cf SHA-256: e56d72f4481fd737fcbe53a0fb27a7479cc42c43cfb402b68259629626c489dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://laborke.ru/uplcv?utm_term=rush+wars+apk+download PDF link annotation
    • http://cabanagarden.hu/editor_up/77368735204.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/mumaloluve.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584a60cbdc---likedetagitub.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/30188640607.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jkgsmg2cr5414pe1adua2nr4n5/58948649478.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/77967491064.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307752e596b---89602984339.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/73039217406.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/10026536947.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/xatip.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161500beec9634---jelutuvidajixe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bc7o7a3gv1tisegjut7ambb0ug/43056152773.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/21811495109.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/pufivirinokodirube.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/87149749405.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/wupojevageja.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nozuzasufalodogefune.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/diroxuja.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150183a543e3---89976766563.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7boq6hbulb0s40ecj3lclcia5l/dagubonululu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/90435379008.pdfIn PDF document text
    • https://cet.sk/res/file/99694548667.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/15912202830.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9c810c44---fijimi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/pifagowugerawusupe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305993a5a8e---23771070974.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/30798551994.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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 16428 bytes
SHA-256: add2828cbe9809d01994e6e86fc6b9403329897a6ceb0b01bea25f897d3cdd51
font_01_sfnt_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 10488 bytes
SHA-256: 1712d7a8ce4a250801dcced56ee645e070b83098f1d06bf6d9dd496dc4cb9e05
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1