Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4de2c1c3604f7a8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 05:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7fd5124a6566f34bd7022b56b10d8c9 SHA-1: 28b0ab7bfcee929e03b85aa637ef7618eb2f3941 SHA-256: c4de2c1c3604f7a8e2c969c4fe716900cd11ec27e3c22c68a00e137426623918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pasarant0g3l-turbo-h1t.com/contents/files/16277068163.pdf In PDF document text
    • http://nigerseedindia.com/uploads/purobadulusijexivuwulolip.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcd6cf432---luliribagisilagu.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/roxilewelogiwufokuwu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pefuxij.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613106bb4---papilij.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/buzexorasu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/janezosovanujodazazusa.pdfIn PDF document text
    • http://elpijisystem.com/file/56828663192.pdfIn PDF document text
    • http://timebymtm.com/upload/files/fenekuwokebijusegurivute.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/65355523066.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/tufuwisusir.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/78374401138.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/pixezitipojunogoribe.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/detelegeluvax.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/mobenine.pdfIn PDF document text
    • https://wrd13.com/force/file/89729631801.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/802604714.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/46813251231.pdfIn PDF document text
    • http://labotinnghia.com/img/files/54375392850.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/laboz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40cc99c7d---zavivivozupakizok.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/33798285248.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/45010571183.pdfIn PDF document text
    • https://5udua.com/contents/files/buxuwedigizorewepidiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=increase+followers+on+instagram+websitePDF 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_off0000bcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB8 10856 bytes
SHA-256: 46aff648d2886675cd63c0d0cedbe1a7a20d7c46183cc78fe29f1218ac6e498d
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 17676 bytes
SHA-256: af0ef7f8f960ee55d16496fdf1bc155f656ee202854242967e48d93a98313bda
font_02_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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