Malicious PDF — malware analysis report

Static analysis result for SHA-256 2047dd77b11df9e3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 00:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98cfbd9df04bc39e019793826098810e SHA-1: d2b3ef1aa442567c1350aed1702ed5255c9f0cb1 SHA-256: 2047dd77b11df9e359ffbce594eead5f4e8f55acf5edbbb31d219554ded2673c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to external websites, many of which appear to be compromised or hosted on disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

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://smidgel.ru/uplcv?utm_term=20000+sq+ft+to+acres PDF link annotation
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/72538775220.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea0a837c6b---gupatu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/84a6d87abc988aae4249a43e003fb50f/xunoliwo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b802060b39f---pexerotukijufemofudef.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/gudefixedut.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076655892d8e---fugumarosilirevi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad535ef1662---48068066298.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/ponepakevebezataviju.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/u68d5r474jtnl8al20lktrp734/fotuputetotanuxapax.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jepotevemawuz.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/49138539189.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/fenaxovetase.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/13202879536.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/18464838584.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/divonafejo.pdfIn PDF document text
    • http://bjallstar.com/upload/file/xugusipow.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e42203ed6---wuruwamarotikimerawudonat.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/nukarexafujubaw.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/72879549781.pdfIn PDF document text
    • https://samowar.me/userfiles/files/84581736961.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/o3ca6cam4h2up111480f8vscb6/neredawurumeradup.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mikirimowazodorebesozixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 18664 bytes
SHA-256: fc2acc09b77754c298b3aaaf5f49e5b27ba68106eb3a52d0c2da3b72841d8e81
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 10376 bytes
SHA-256: b30b20caf2388fad07ae77151fc75651d81f19b412b78cecf42b6b156b4deb52
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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