Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee794077ec5f783f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 13:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 589a8bf8152c7f553c54e267e73dafbf SHA-1: a41d9d37dccc16e28cd02ec5800cf5c78fba96d5 SHA-256: ee794077ec5f783fff8c9aa5574c1a1b260f189025e8eba9a52e9adedbadfd35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://666666.vn/upload/fck/file/49885643382.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/romamelemezetozemevad.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061923105773499.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97883bd5ee---vedubirurimofamituxolipe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dcd0efb3---16092888282.pdfIn PDF document text
    • https://best-label.com/upload/files/34741575283.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wezilorobufara.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/26298529016.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/razukamigiziwibabivewane.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/3394670432.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/jokufixifumidomev.pdfIn PDF document text
    • https://inks.bg/userfiles/file/buxipenivopikazakegawuli.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/78268475716.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/35465274381.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bbd302d512e3f81223bec51d955e05c7/38598349755.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/4429500209.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/68721264219.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076792f2dbb2---mefuxebuzas.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/32753644613.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/93991255336.pdfIn PDF document text
    • http://armanetti.com/images/netinokowakavenasaleki.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0dfbe53c5---nimafigizelitasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gerunds+exercise+pdfPDF 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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 19280 bytes
SHA-256: 6e44e1c1d1c1403961b92eddac0ea15cb4dc3c392748d2934be3cc6cdb20d868
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10428 bytes
SHA-256: e6d226efd9882d12fa062ac68e3f8086a5bdd6946b88708428c711b91d82d309
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1