Malicious PDF — malware analysis report

Static analysis result for SHA-256 d011702a648cc56e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd1e515207242d51313d60758727982c SHA-1: ca9115be02a7f8a928ea795414c53f6fb43b998f SHA-256: d011702a648cc56e5934fc75f10a4eed277c812a2574b4bd1af0fdc4362e54d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a common technique of using documents to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pistant.ru/uplcv?utm_term=match+masters+hack+code PDF link annotation
    • https://my-natural-style.net/upload/files/21995096726.pdfIn PDF document text
    • http://x-mobio.com/upload/files/76390585659.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/liremada.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/46900574368.pdfIn PDF document text
    • https://orrizon.ru/images/file/25875705054.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/98407671319.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/928471463.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/25475448465.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/83367121277.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/88374367471.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wuwaroletijepoxofut.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/bejenetus.pdfIn PDF document text
    • http://biosite.ru/images/news/file/71323766548.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/xavasixifabonelukaduboz.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gesarixenuf.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wumigevowaponixuwapivoj.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/zirifo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/bexejanukeben.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1053294920613f9e3d583a3.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0ae6d309bd74255e6e0fea78812489a6/95520086552.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b1762b96---21678546934.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613604ab47a99---86708575107.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/wenufepek.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/75100005856.pdfIn PDF document text
    • http://baove247.org/upload/files/54975905667.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/bukarozijigo.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/25661511876.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d87e0a31403361a32bc18f079e24c641/91615318805.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10480 bytes
SHA-256: 39aa65ed283058cd3bf631f340d779343081f4a1997e2f88414c933f22b8aecf
font_01_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 17028 bytes
SHA-256: 1b58dc54b3738715de8831396386919f666ab4927d5bad2dfa0a34b219589207

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