Malicious PDF — malware analysis report

Static analysis result for SHA-256 70125dc6f280f2b1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 15:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a323ae86c4e5fa37741d072b3d28e70 SHA-1: 31ac561de8733079c4b4a430f7fdd415f1e19c62 SHA-256: 70125dc6f280f2b13f1370d86d48dd2f22200a137c0a297d5cdf9b92a7bb1252
156 Risk Score

Malware Insights

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

The PDF document 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. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to infer a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://wastran.ru/uplcv?utm_term=android+sd+data+recovery PDF link annotation
    • https://marathonblainville.com/userfiles/files/85801590283.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149482926f8c---93606730469.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tobarilasudadisir.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/begega.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/gakejelodiburivagibexolo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/baxudos.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76065922786.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613956f3f1089---78351050357.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/nosoxiruk.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/5870093469.pdfIn PDF document text
    • http://vaynhe.com/upload/files/koxakuguju.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wifebuxamotu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143d17f9ee2e---66744753181.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11433846051.pdfIn PDF document text
    • http://wernitznigg.at/files/24116590365.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/40302643793.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/gojefegobaganole.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/tanataxuxonomaw.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lovatoxubidimew.pdfIn PDF document text
    • http://redactron.com/userfiles/file/81170449564.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109141257405141.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/52266924392.pdfIn PDF document text
    • http://awards.nl/img/cms/file/mazewubugojikavuxejuvirig.pdfIn PDF document text
    • https://cmoretv.com/userfiles/99599893267.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/117162178.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54006197590.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10476 bytes
SHA-256: 7ef44f86d260a5c57a24cf72dcbd61c995c6e7291c2c2179a6909e020e176770
font_01_sfnt_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 16244 bytes
SHA-256: 5e5c84d9cf6c72e2aeb36984301cb0b59bece63e5017338a57e66ac77b7ccd39
font_02_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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