Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30a70cf10a4b73b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 22:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ed393c4a6df8391258ac9f25f3e8c936 SHA-1: 4ef852921810c1ccf002d0d4caf1c4fa77cc29d4 SHA-256: c30a70cf10a4b73b1aa69d53b71889875cc5c5855f148f8aa2db7967cdde5d7b
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eyupsifalibitkiler.com/resimler/files/28600081430.pdf In PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/68615182728.pdfIn PDF document text
    • https://papiratisk.cz/soubory/91190100078.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/disigefufanogoku.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/76378664027.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/64039868778.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/nixopegerijatoxudope.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/mozikofupusutome.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/23996239706.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/zojisivovo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7ae525bc---pipezofonogutaxa.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/jexib.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wulomemukof.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/41742000899.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352461b65b4---80108682932.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/55139184798.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bawifegi.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/bejitilofepofotove.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zobiwamivenexedinojewodi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dfe7414d---jabutaforebefimazitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=easy+beat+apkPDF link annotation
    • 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 17908 bytes
SHA-256: f9e9be33788f7fbb7f554dd93de70915c862d4037e6a3057b5477db3f6de619d
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 10112 bytes
SHA-256: 298cf3c11be69003c9cb1d031a8808c795ae6d4bcf89b4ee6b45fc27412308dd