Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bdb2c5a5f41dfb…

MALICIOUS

PDF

82.3 KB Created: 2021-07-14 03:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7aa0b3cc73ab7bc5b39aeebc534bdd2 SHA-1: edadcd00ab8186d01ac13945612bd34f556c2c8b SHA-256: 18bdb2c5a5f41dfbd880c6134898bbe0007fdac16f77c38b6dc89a07a5fc2e1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains an embedded JavaScript stream and a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting. This indicates a phishing or malware distribution attempt, likely leveraging the JavaScript to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://irlanc.ru/uplcv?utm_term=lego+sith+infiltrator+instructions PDF link annotation
    • http://tw-go.org/files/soxakepozinuwuviz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9f1ae555---7966847648.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/24411619979.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/38670239842.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/30929102974.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/77265383205.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dee2ed220---nixijuku.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/587aa612bec5821496d776239d625244/7831232545.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ojunetedip.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b4ff98ffe---74885384790.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/00err00j9h95qu5rbsl1khqvcd/57394487655.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/tajuzegabekisetesak.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sb4adkqevca144s50ial1t12ui/xavuxusemofu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/deb76c21cd312a747f8a653903e3d411/xipelajonaxazurukunazonel.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sjbtcs0hb80icku0o3lrrc2ni4/89930976255.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/30736091831.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n8dofhnhkdsenn5hp62rtfodj7/42714901815.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4c16c0fb---wajix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40248a78c0---lurew.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/migoruganapo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qmk4e8lkna997naqgfjimnnf26/benexaxujidorever.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4006eb043713e3174a3dc067dfa40886/xixategazapiw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb7a98836e---rafetelofodalewapab.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4017f55ada161837e738c3786cb551e7/ziwenogugofifuvak.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406ed462c6---kilowifogekitirotot.pdfIn PDF document text
    • 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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 10672 bytes
SHA-256: 09f2fb5817cd10af8ee95453bf197c78d2bbfba5424887a4ada46ef5af0d68d8
font_01_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16280 bytes
SHA-256: 1876f3d2c47017fdbdd4c02fd8cb2e9d16652a8008ef2d4f6ab41ab474841de4
font_03_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 18272 bytes
SHA-256: 14d893048cf5895005379c8e3373db983ff23b4358a09af19ca702307501a17e

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