Malicious PDF — malware analysis report

Static analysis result for SHA-256 8154ea228e33554b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 11:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0325c75d1fbc6a48d3e3f5a0a16b79d7 SHA-1: 96e526fe7b5a65b942374c053c2fd2655fbd0740 SHA-256: 8154ea228e33554ba1049dbc9c82be7622bffad62b5a59e53420e497f150e55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links pointing to compromised WordPress upload storage. These findings, combined with the ML classifier and ClamAV detection, strongly suggest a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wskinbody.com/data/boardData/files/nipubasaxonoxikekix.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c27bd79e93345d7c08cb4f1653a0d43d/vimipozawap.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/benaguzubopofinag.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/88580324514.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jimupilegosagazedito.pdfIn PDF document text
    • https://khanikango.in/file/16618949936.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/ritipaginovovari.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b9c7e1c1552db12f8861c5637db7d78b/52657780491.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/20015068752.pdfIn PDF document text
    • https://majubesar.org/contents/files/jotuwileruxaletunare.pdfIn PDF document text
    • http://voijin.com/userfiles/files/23606099259.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/pimivon.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210909052747_186931248.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/fizifasobopowopepaka.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/famatedagal.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c69f2660---rulipe.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/futomodofovoj.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/99047be0e653bf4838aaf4f712e89c21/22855497812.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161395ef5bedbe---vikadajazotox.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/8604157970.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613099ab72d50---23048140129.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/76669685240.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bejubirelefaleluv.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/56236561967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fastic+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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 20232 bytes
SHA-256: 22005e2e3e383255ebf1fea52cd990d7312bd182292a37b020e0ac1807e70065
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10360 bytes
SHA-256: b04321baf7226c2c9db5df35bde3ed537dd1a95952c4c6ba3786498fb0862c63