Malicious PDF — malware analysis report

Static analysis result for SHA-256 97922ba2811b0a05…

MALICIOUS

PDF

67.3 KB Created: 2021-06-18 18:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 96e2aa4c12dc59c955dd036a6b1977d8 SHA-1: 642e7cab83c479ffad3461e39e1badbbfae48c74 SHA-256: 97922ba2811b0a05c8bbc73f7bfa451ffbad7f0f58522f0e3f5a44aa651a408b
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 5

  • 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
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5201c332bd---14888236445.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce9f90101---28979691094.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/43730894304.pdfIn PDF document text
    • http://beiks.info/public/file/8940426376.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d7773d1f---rilade.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3be2b8ecd9b2e2d2d3ad0498d3ebb6bd/bezeb.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3df1118c---weboba.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/juzovu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/62830217010.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50b676ec2---43007448449.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8833fa17---gabefunawaronuwanu.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/fadanuketofem.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6s9isu8t34oob1qr167ben6v40/fadosuvivinawozeve.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ea90f105c637a8a3f40d10bf8e2bd739/fekokatomujo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c15ee5e1---pukenuzimirawekikeja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=among+us+mod+apk+2020PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 5476 bytes
SHA-256: 342ac47e9a7cbaaaebb8198114facfbac506bdf570f7c3601a91d19b0a61ce13
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 11948 bytes
SHA-256: b2101721a5820d7afaad28d6dbcaaef47998a94e365e8bb0ea046fb923134ac9

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