Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e7ceb9d1c9a1e0…

MALICIOUS

PDF

100.8 KB Created: 2021-07-31 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bcdb93304057fcb5efd8b5c1e9d05e5c SHA-1: 838c71e0fa13c7dacc80eb23ee3cba672f1e48f7 SHA-256: 28e7ceb9d1c9a1e01eceb66f28fca3cfcc19a98c422ec53a1cbe4da327977faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1734634e6d---porutojixijuzerusimonire.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78ba353bb---givudogobigolo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/lesajidikaguxakimuxo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde20ec9de---21697905847.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/07014e1d6cc359755f5d8ef124ece982/84135867087.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5125d70a8---86248473620.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d23e85852---gevotugut.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xerasukitotiletuto.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dd483882---jifol.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8ce5e0b---bovagubijav.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fusapejuj.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/73854073817.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r9jg0jhpubis1nb61q3h7noch2/gowojumatitekilomim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9096e93a0---medelibuvaseliwa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd613b1fe1e---44701699291.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/73544735580.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210725_B32CC9FD54323445.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbce5f667---xujiwojexokigorarapepovi.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/32694541729.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/32883222021.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/14733271184.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78417137375.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/busekobunurosujoribol.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bf899e3025c89f8976b98f73b40ea003/86315752014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=super+mario+crossover+2+unblocked+99PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 18084 bytes
SHA-256: 359e60a8902664270fe4de54d30fd246e6261762cae32733a30c880358d1c1d5
font_01_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 17460 bytes
SHA-256: cf573eef000a35180736e7c4a2d1ab89b5fa25b7f3955abdbb8cf86895866aa7
font_03_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 11336 bytes
SHA-256: ff7becd76a4cb444aaaba6ac6fa6872075c45b58bab4bcfc6c4f1407b15bec7a

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