Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a7a1b042e7e5bf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 01:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e92bcf3e2b08ee0719748d0866f7884e SHA-1: 06d32365dcdaf6b1ed432ffed0956f1ca859cab6 SHA-256: 56a7a1b042e7e5bfb33e24dfe00baaf4ebc9781845c090a42d107353371ecfaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138330c717a4---ronoxofewonelanalibavilib.pdf In PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/vojusugor.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5e0519e68acf21d5f834c6f822e93a5a/sedutusatapekuk.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc8ad96f3ef7c9c49c9ee4c106b678a6/wesavuxu.pdfIn PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vuwudu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/76748532306.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/raduweralidarovapuroxeta.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/ketobelojuxufuxenemexe.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/fewan.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/vozis.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9e9fc5a44cfdc9d7f0e37fe6d01d9e92/60691508533.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98773271531.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/85959917030.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/feluvedudibasumivipuxazi.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/mokurixalaxanip.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/78038050386.pdfIn PDF document text
    • https://jobtiara.com/files/files/bodiso.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/sikukewokosilud.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/rupif.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bosijixarowusefaluku.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14078195276.pdfIn PDF document text
    • https://fong-cai.com/upload/files/14074898779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pixel+swipe+to+go+backPDF 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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 17828 bytes
SHA-256: ce7c498246a91da582bd52a27d53cff72a93a622e2d4039fd18483b58078c4e3
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 10764 bytes
SHA-256: 60e1c333e7aa1ec4328ca9a6cef591991d3267473d68d442f5044fa55d86813f
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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