Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ba9ba304deffab…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 14:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df69d471508b761f39b473d69e322bef SHA-1: 31c67d8d166062a242f2d1fe2cb9a0e39776fe96 SHA-256: 97ba9ba304deffabf25b782ae6aef3c6ead509ec06e3d1a637f5418307d545a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a distribution mechanism for a secondary payload. The presence of a raw IP address in a URI further supports this, as it bypasses domain reputation checks. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to lure users into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hram-uspeniya.ru/ckfinder/userfiles/files/52169528126.pdf In PDF document text
    • http://hy-concrete.ru/d/files/25138309364.pdfIn PDF document text
    • http://beateromer.com/bilder/file/79518235282.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/zinapugejojezibodugixi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e95af3ee7fb53df9173562a44f3d1ef1/19394012746.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/74596059467.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ab7390e00---59096015896.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/ranasewatizemafol.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/66065792605.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f1e630e---51667391812.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/90474697661.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/parovawixuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1lpv2aa4vc7uk8pdpjb87da11k/81160482829.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gofuvexonikeku.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tijabegiparozef.pdfPDF link annotation
    • https://parklanehotel.asia/userfiles/file/40179892077.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a182d38d68---jerez.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3934f124b0ae97604f34cd52a686f965/78911105457.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077094232d71---59474064148.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d4690542---zufotubudekibep.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/9346955395.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/37106968422.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae783649ecf---56384435871.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/lixamodetafuxobudali.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/85131646246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+bottle+capping+machinePDF 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_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 17668 bytes
SHA-256: 459477e32f7b2f59212907f7487184c8c6143931eb7f095c8b7c4e356acf7bca
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10784 bytes
SHA-256: ff2bbc3145e7edb7f3b218e90fa5d410178412ce7b944fb5624c45370ed439b0
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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