Malicious PDF — malware analysis report

Static analysis result for SHA-256 b548f9d9bff2b812…

MALICIOUS

PDF

90.9 KB Created: 2021-09-18 13:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a939aff210f3a75f36047823d8171176 SHA-1: 7115ace0370089f218e461ca47901282ce09e36d SHA-256: b548f9d9bff2b812b1715fb070b46559a9bd0b9799a98323104c1842ee91936e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://upaspor.com/resimler/files/30606280740.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125ac35fd0---gugagita.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614395baed02f---22674463404.pdfIn PDF document text
    • http://autovoda.ru/upload/files/41782340235.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97675672735.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/79495660557.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/lakixovegitubutuzuf.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/buwasoxilo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///korem.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea37b83487---68616043252.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wojofibopob.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/87221556126.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/72476334549.pdfIn PDF document text
    • http://offerparts.com/upload/files/62595428188.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210912035904_mkppv2.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/41d0dd3deb2d608ddf91c61bcf228c97/34561301386.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58399529110.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/64714158141.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/lomekar.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142907366d96---79229829247.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wesulivekaj.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/furozexutezuxikesapibim.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/ribuwipimajad.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/61568956687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+7s+price+in+bangladesh+2020PDF 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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11080 bytes
SHA-256: 3f27a4be75214b6cc9514a33b785cf2be82ac8e1189cee03a2ea3fea7cfc1364
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 18940 bytes
SHA-256: 9199fdc7b202d3f0d9dff8df81d8ad6d7306253bed7cccf67930fa2c0ea5095f
font_02_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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