Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa6416c7f7ed43c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 08:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eb7eac858736883a4b487998e32492a SHA-1: d37e9269368b643f4a88a512eae781c6c008097c SHA-256: 0aa6416c7f7ed43cec7a44c063b517eb6323329db0375303fa361eb53bbf75dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://izeninfo.net/admin/upload/files/vosesimikel.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766ddbf5---82365763137.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wukurulosijibasogu.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kuxirosotigobosud.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613add678b4da---28311467656.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/situsun.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/59437734605.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/tekafaju.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tvqtmbviffkecurji4sr32hi1o/pebodiguf.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/50245954547.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/32640982880.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/fipuwat.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/bakalegetivuwugamopobijub.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/rejovexulelozejun.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/werovejuvefar.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/55784624883.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a37bac5b4f0432520759163bd10b469/11136967775.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f2a526ec0d82c16de9adcbf3a0e6723c/4194237782.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908171900_033br3.pdfIn PDF document text
    • https://digireg.it/upload/vetezajovumuzenasonoguwa.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/winunaxe.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/bapusefuzatuwoleg.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/jefezut.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8bc161acd9d28eeac029e8cb56faba49/98942610126.pdfIn PDF document text
    • http://gzwep.com/img/file/2021910124359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=forge+of+empires+mod+apk+offlinePDF 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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10812 bytes
SHA-256: 813012d006ed634fcbe1d4b4b934aa63d16baf1a1f2d10d3fff64af060098388
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 17616 bytes
SHA-256: c7641602d4cf2df63375f05effb1af27340f8938785b7d4771c22951f3d69c4f

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