Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c832897d6d8f6f…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 02:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6587ec19595fa883ad4bb7dc1fa63de9 SHA-1: ed96e69e711479c267b6ec06959c6a6d3cb7206d SHA-256: 63c832897d6d8f6fa3fc0913909923a825f2ff4d47209e19a2958bd9e12f505b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca38cb0381---3739415964.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/tebutulef.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8a1e2c151---fanabevik.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b83a43253---kafum.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/32561030931.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28305080460.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/4079184494.pdfIn PDF document text
    • https://luminex.pl/upload/file/mareroxijefagix.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/8399578270.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/vovuforiwa.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/50631912084.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/wumesenufumaziw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a14c71c23---27521998194.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/kuziwelozani.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/90465059786.pdfIn PDF document text
    • http://tms-operation.com/upload/files/gajonawelefaf.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f4fdddeb34fc36de99a570f6ea1539a7/12641168586.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bunaxu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210809083135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=auto+body+technician+job+description+for+resumePDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 11304 bytes
SHA-256: 1aea8e7ea648e78dbb1e43cd03e732e7a8f607392350592ae74eb289ed0062d7
font_02_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 16636 bytes
SHA-256: 7ce202d26c8a2af668f23b17d972902ca2130b62a5cb96b05760da4eb739e26c