Malicious PDF — malware analysis report

Static analysis result for SHA-256 e729838fa4d1939d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 00:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dacb4ec4a146bae57503c1ca17a65a5c SHA-1: 3000f0d65187bfde1155f53ad4b1893a1947fd41 SHA-256: e729838fa4d1939d01cc462709e622aee7c9c0e6607ceb12a9c48a7d510977b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cambridgekapurthala.com/damana/userfiles/file/18962321816.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fcb5dbb37---pusekobufopufefefububibe.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/88430054207.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9a628327---sunorozat.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/d2m77on0lggukoanv7gu0lctfb/repivemakef.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/zemafonudu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2afc507bfa0a515eb7061fd4c81ece09/xifim.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/gibupativ.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zatoxitazizovexebatofokog.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/89633788532.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a431706e0---88910071510.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b1f48a7c4---zogopetufiropaniletu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad52d2a79c---30931197382.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/lixisewiba.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2bfbbdd1---wawenapepuge.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/19298173231.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9c941e62---61629086181.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/balokola.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021082408423620.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210730_182704.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/42942674706.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/99184090826.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcb7327ca---49873925966.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/dfd13f6cf638fc517c868cc38140e80a/472685033.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/75694402813.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aea4139b6---gumewowonub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=approaching+proficiency+in+tagalogPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 18004 bytes
SHA-256: 7641867f2378fb66f6241c1983eabd0faf070816df8c5cecdf5f3e64e9da74e1
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10684 bytes
SHA-256: ca67e50ab83b64ea662f0291c64267cb0c0af1d8764c13df7a0477bf35ce5f97

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