Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c26ef15f77d703f…

MALICIOUS

PDF

99.9 KB Created: 2021-07-19 11:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2658e11d74ed69639867f797cc4beab8 SHA-1: 932c9820510497ab2f0f8c0d09e5a75d1807fc1d SHA-256: 7c26ef15f77d703f92ee04aac888b6f223c7af7be2f239866ab66a056a28b0d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://faprosid.com/file/20972527035.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c202aba0---77223241658.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4431d220---boferekolorajajofodab.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/32507163127.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bba71b7163460456797194e0a19fb800/88913870156.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/71132297783.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/fupibo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mko6q09r68d9vkn2e8rosg20b6/furerujutamotu.pdfIn PDF document text
    • https://hgb.se/filer/file/38899799647.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/xugazelutanitok.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/zaxajogujadegoweruv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/22772217984.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/19097525b5bbb4e6274f85e3f31900a3/43607087780.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/5181395637.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/39f8d4036ffaa9e41e5838a49240c8b3/nebowekuzu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6ojdbs33mqkpek5kt3to7vr49u/65717373077.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/suziveva.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/rebonumeburoxaki.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075280aa941a---8614341862.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/mazizawuwa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/97945bd9360c9484b4dc47cb58288f3f/41442197413.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/lupofefurewot.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/01ccebc736e2e0a28a7b321bca341f88/wubugemubatubebasini.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vsu0pui6tee4i90mhvibd93v0u/tovarufipojuxolifajogez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=words+for+grade+7PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ed34cfa72---wekekow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 10232 bytes
SHA-256: e19fed6a532f7304255639bb0db8b4081ebd28d52d14a7a1676f9d0dbf1e4942
font_01_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 17156 bytes
SHA-256: a035690bafc46c1dbd67149035a35995c1b840ffb4b1df17080c3f46ab09ea9e
font_02_sfnt_off0001511f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16930 17040 bytes
SHA-256: 511f6993446fb9882edf668536ae90126763256f838554808b964495ba5aec39

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