Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee78f40927a01249…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 09:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 648acf702a9d51dd8523f5c990212ff4 SHA-1: d9d230c0ab2b61ea70464535e47b88042541d703 SHA-256: ee78f40927a012495692e5ef0ec1d0c8def778bbd826e75311fb277c432423db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links suggests a redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=top+10+coolest+fortnite+skins PDF link annotation
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/1497022414.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/84810186307.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/66409496642.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/35141507152.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416e32116e8---11561148200.pdfIn PDF document text
    • http://cochemical.com/upload/files/kanopo.pdfIn PDF document text
    • https://devisme.maxtis.com/userfiles/file/21587614685.pdfIn PDF document text
    • http://armanetti.com/images/vagesutivezatulefer.pdfIn PDF document text
    • http://pneusmarene.it/images/file/66694792697.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/xagimojulejopukiwugawa.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/bobaralo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/bisesedixuvube.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/54f3ba94e65aa2b90e550eff6f8f8359/91940256425.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/zanifopuwovijukizopolir.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/14013627171.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/48843884417.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7e66b333---vadowevusexe.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tekefiwekel.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16143897eac0c1---xitafujavaxubawev.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/bewudigen.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zovixoputob.pdfIn PDF document text
    • https://businesslife.com/content/files/zugokogidateku.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/kexebugezutulowivadinovi.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_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 18992 bytes
SHA-256: 0bd8ec2c6326d8749ae54909196de4b21f7a5a5b98da1fd0c68a45a7b93ca402
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10540 bytes
SHA-256: 362e3e4f74211874c07c66b6af9f8f4c6f20b02495b7ba541c7a2d6458d5fa08
font_02_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1