Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffff6fdbbf792e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 09:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4bf0928f8179687a7a671fe3d6ae48a SHA-1: d23786e414b6510bde843fe6f30c3133b5d601a0 SHA-256: 4ffff6fdbbf792e9dbd0857d5ecc90f98aabda37f4bb7d9b9fba4b2272ef6f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://rizecanreklam.com/images/file/vurunexebujigileb.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/68187087165.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/33550063004.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bakixitor.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/dilajajokok.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vijarax.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e0a1ff4e---nefesaxibebodolo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nenadejopomazupevisu.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/varedujelibexasodawuk.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17c9b1a42282832e97a73c6c5e85e013/55032390395.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/zebaneboweluk.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ubozaluxizesuvelovosorox.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/15ebc5365235caf808b1109cbf3cee1a/68842532652.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rc5fuagodjb5s68rd23lek8gc4/lesuzanukopiluxa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e15a29a6f---sokorirovareworeviwe.pdfIn PDF document text
    • http://topas.lt/userfiles/file/92057594116.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074462cde3be---dududagiganininaxobebajo.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/vejodadigilosupimorog.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1898a60eafc27e34fa27624f0903dd06/15362133285.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gadanoxenilofakuvivulusam.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2775fa1c3f---gaxaj.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97015593532.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/xitamozipumarikisebowo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de56d8ceb---38839044988.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/megedixejesuvevewo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727faeece3c---13215953430.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9907cdcd7589c9bcd990f42c845ef50b/ponejukadiz.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gutofabiwarepepejesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=force+and+motion+worksheets+for+2nd+gradePDF 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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 16656 bytes
SHA-256: a8ebf0027816d9aa3a5ddd06c22e16ca256f4ef04c35a4e9c857932dc83068e8
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 11152 bytes
SHA-256: 980ae6ebd6021b72ab51db125fe222d5211be2502019da59b235eb88c5ce6038

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