Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4d4672b37ba934…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 06:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c4c94db76d0a6b7e747742c92ce3efe SHA-1: a92fe8836309d3f3f6f10a2d310c1ddb5a9283c0 SHA-256: 4e4d4672b37ba9340e33c3a23f7c4cde5838e0a2c7dba567c360364df8832a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload locations or disposable hosting, forming a link farm. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7726d0ad45fa9e444a3970c79f2b9797/19356251201.pdf In PDF document text
    • http://melinterior.ru/userfiles/files/wiwugafevamudemoxejevit.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210829162958.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610d6c179b038---watiberubixilovemeso.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kaxodok.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/vujubulovizoxifudakej.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/63678706049.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/gr1hvsptcjjqj5vlo116474bm4/punuzojabejulenogosegawi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab17481703---tavafi.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/7022402179.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d511b37f2f---85482001974.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/4690582043.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/soganavud.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gurag.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/noxoraxonojazesos.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9acd3caa---70744769441.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5f2e638b6559562a3359cdde3303bb84/70381303830.pdfIn PDF document text
    • http://mylodge-naoshima.com/18102681977.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7dd5a387---faroka.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1f269577386c335aef38b5adc48ef24c/99713644533.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/fekosenokozume.pdfIn PDF document text
    • http://zenithmetals.com/files/guzejomemisumebimunev.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jiwasutuwodifatesak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kindle+paperwhite+user+guide+2019PDF 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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 17864 bytes
SHA-256: a1fee32935a04f63e281c2cd7934b60e7bd865aabbf466ac231345862bafc7d1
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 11188 bytes
SHA-256: 45f1852c274ba17128ba0ea68789531c4762e41d3dacf4d5567e3d89e209bf15

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