Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd782a5b83ec22a…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 00:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f3959548815f4181deaf13305eb2839 SHA-1: 3b9d8163148ef89823b86e124c15dccee703e8fe SHA-256: 2dd782a5b83ec22a88bddde978f61d6fe2fab4ea7bd7a59e49f76ab391f36137
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple disposable hosting domains, including compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=genshin+impact+codes+wishes PDF link annotation
    • http://liebherr-tr.com/userfiles/file/28906450348.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/19902238583.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/94975450325.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/51612760609.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7d9190590db869f10ac990a5d5925191/wemodobu.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210918_71C0B371742DF669.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe82407b4---10804062924.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/vorugufegisizorexipemamot.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/gixeruputijekobeze.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/voninuwose.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jma3lp0uev6mol29rokne2421/monaferakubededetupijow.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/93218996621.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/poderusunaverofed.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/19186038224.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/4444457466.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/diwokafazibejorexofevi.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/36920477665.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109191912267037.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/30261698342.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/17871558291.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_off0000ae5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 16100 bytes
SHA-256: 2fd74777cbe56ef2b8dafa14c0be5687e173ac6b5de88195d02c84437c6151a3
font_02_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10760 bytes
SHA-256: 1a6f84edb8aaa63476f90764cfa40ebcc31da197472bc5dedb9dc8dccb127629

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