Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b76c40b51b360f1…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 19:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecef1bbebba3bdff768f08b5466c51fb SHA-1: f6f8f539b9d0f54436106687895ccc365b17da3a SHA-256: 3b76c40b51b360f172f7c203b1ecb0782365eb2eae6af0fd7e5afcb1dd3d1463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=free+evp+app+for+android
    • http://abwbaltimore.com/uploads/files/dezufelewewofun.pdf
    • https://suncables.co/images/file/21175754530.pdf
    • http://huefpdf.org/upload/file/nogupefovenarorosabeta.pdf
    • http://www.cerel.eu/images/wyswig_images/file/xufavawunok.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/takidu.pdf
    • http://pp-aqua.com/userfiles/files/nikajadapajutonem.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/16350206412.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133963fb2736---mopililojutebimijojas.pdf
    • http://noithatphathuy.com/Images_upload/files/69392345406.pdf
    • https://nffcd.org/userfiles/files/93367413695.pdf
    • http://magooferta.pl/uploads/fck/file/16176452194.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/fodevovijov.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/tudozixoborigixugopidux.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614048fa22724---vekopinaje.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/vifutupobitiporunazep.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd19facfde---zojoxuvifoluriza.pdf
    • http://yingtailong.com/upload/file/21091210364895854893cnd0ue0lic.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8b3cd3e809bcdd17d562d6e0bc153bd6/pepixodasijoxixetukuxefan.pdf
    • http://stroytehcentr.ru/images/file/97089657484.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/tidutebupulakexidolevinuf.pdf
    • https://almuhja.net/ckfinder/userfiles/files/62266914370.pdf
    • http://jmyhship.com/uploadfile/files/litabizetawiduzufo.pdf
    • http://candientushinko.com/images/file/fifopopijux.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_off0000e983.bin
010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 18056 bytes
font_01_sfnt_off00011863.bin
8b85d0efb8ef33d56645531e086c2b2cf11bd68c48a6eadac5fe620a921343de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10220 bytes
font_02_sfnt_off00012f5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes

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