Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52368f34169d31d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 07:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4afab6fc8426e12a7b97e21d2d042d78 SHA-1: a9f5ed5582ba0ed8998f399f15d278db3aeb6d45 SHA-256: a52368f34169d31d1ef115df4cadb87b2cb570f4a46b9981e3988c196581b8ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sfasg.jp/js/ckfinder/userfiles/files/47560820155.pdf In PDF document text
    • http://el-system.jp/uploads/2012/files/petatexanu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374852decc2---refubamur.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/13477534097.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/91411062434.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/90240358379.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zowilezunu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee4fcc651---81142569400.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/kipiz.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bowijusimen.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613491e1023b4---76349969841.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f7c425f0f7ec9706bbcacd2f0d2b0345/dulodofenutodakesuwufinet.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/pugefixewesugopirali.pdfIn PDF document text
    • https://777mto.com/contents/files/52212739500.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/44483156956.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/92416399543.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/gubimogusorek.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wufor.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lumigomarogumu.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/8521849787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=websites+like+gomoviesPDF 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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 10376 bytes
SHA-256: a2af3d118f87dc74ec76079ad3d6268a297a5e956cdc7810677082cc4ac1e8d2
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17116 bytes
SHA-256: bce204f36899344acbd86c82e8b8171bd40694ae18ac35e8fcb9d8e48c61c8e4
font_02_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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