Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c255b8fa33ca31…

MALICIOUS

PDF

96.6 KB Created: 2021-08-17 06:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60d7c69f2c1862ddb00a1337829c6711 SHA-1: c9747ce7a1fedbe623f5418382b20bff6d6f178a SHA-256: c5c255b8fa33ca310a647e5a237a8c9e0b5b1a47f1673bc2a31a02c1fe15bc97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The presence of external URIs and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=%D9%85%D9%85%D8%AB%D9%84%D8%A9+%D8%A3%D9%84%D9%8A%D8%AC%D8%B1%D8%A7+%D9%83%D9%88%D9%84+%D9%83%D9%88%D8%B1%D9%87 PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cd06b66151a861f1227d92b5fa8cf47f/pemowosovevenilabilabalit.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c669a3c81---70103169097.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/29018253023.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1k2d6bpgu57cgavtme6pe85511/nawasolifubodedifezezital.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43441d488d2e675771333fe4e419d06/88743326377.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/naxofalemopewazofaf.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/9656494474.pdfIn PDF document text
    • http://samtekelektrik.com/files/navabimexu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f898e0b7a5bac6d1da4d5be6f45bd91d/60106506257.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/aa6fcc3fcd7fd97ec94d9720eb0f48b8/terorodifulivadolugigonim.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101022aea639---dorere.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jraj05bjqmh9omsh8n50vq6ps2/wuzezobov.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/1628855705.pdfIn PDF document text
    • http://skupka23.ru/upload/m/toxifut.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/28333510120.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eudkcnamptv1sn88i35j146625/rujedo.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210618_213E76A82020FCA2.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162585671716.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/85734934779.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1090402f58f0f2d0fabb34a5bdb4593a/pularidonukelotubufomoxir.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/573e73829edc6f18f56102b94cc90d00/gineropo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a444fb851aa---nifoxuralerunapifexixiva.pdfIn PDF document text
    • http://artepcb.com/upload/files/ziredejado.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2df7c5022c3b3f5eb5024504f4bbf5fe/vesakisobifexoxotigomoje.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00011bbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BBF 31464 bytes
SHA-256: 48f9e7d5bb0428f816956bc937ae5f345393dea2cd9dc53c1d204e53c2cad132
font_00_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 14088 bytes
SHA-256: 32e422b56a745c60edcb359ff8c9e922cf6ca3250f24d067d89a81c8f564e018
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_03_sfnt_off00015365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15365 18576 bytes
SHA-256: 149b06212651789a5d65db06ecb24de752b7b50a44eb443e840147f6a7150743

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