Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61621c441cb5c4b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 05:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01eea8134cfbf1ca55446a2d0ddce935 SHA-1: e093d52324d2fa3c22aa4b7c63f3bf5a9d72043a SHA-256: e61621c441cb5c4be2cac61134d3790ab3299ef0c085f7e420cf79a9aea9e49f
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 and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ffarchitettura.it/userfiles/files/sewufitavopixusapodo.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613858e3b9a58---59578026757.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/54475740272.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/7760812132.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/88235019673.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34648678408.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/461111772.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/91510768724.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161333fd22de06---84981424117.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/38201366763.pdfIn PDF document text
    • http://boldogelet.hu/media/42420598361.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gewebexemefe.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/dobakuma.pdfIn PDF document text
    • https://agros.net/uploads/file/bewipinonad.pdfIn PDF document text
    • http://emannsltd.com/userfiles/51560607124.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/88043188543.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/wedaliwosezopofamoxapixum.pdfIn PDF document text
    • http://ijfbn.com/editor_up/55799609320.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/guzip.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/599976b24971e41620c55abe454cafa1/45247325950.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/84464791204.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zapulepopirebupowag.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/97278491905.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/tojamaxu.pdfIn PDF document text
    • http://elitacasa.it/images/file/sixus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=popular+car+driving+mod+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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 10716 bytes
SHA-256: 10697bec7d617b3af1d5a2820c6ebb0b13256ac0d85ea38a2d1d1f6738c5ebd7
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16608 bytes
SHA-256: 32b93c3b213eeb1071bdb18fd9c2ae937053540b92f4bb85fe54e1fd63cca05d
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1