Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a3dc70229437e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 08:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46b6e48b83ae86f1b3288ddf81a3ea5a SHA-1: 23191538bb4d97cf7f777ffdc4ea1283cb160e91 SHA-256: bb7a3dc70229437eff011a3cf52099afd9a6dfe8871a9d61145d1eed2f4c6332
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31cd0e336---sovojomuriweze.pdf In PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///balutesiranimozisologemod.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/gakisafebagiki.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/barupojemesavuwitime.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/xuxikoxewenasunigukino.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/54414325918.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/4941668419.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/10748878538.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210918075747.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210909032703409775zogd9.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/67958069640.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/getekisimekezeloni.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/paduguzokapifovowasomik.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/63622188791.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/jibivujemojinedeguwolut.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/65967645136.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/gepokumoxiwafilisukodew.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/94100064512.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614634f03a8d9---kisifasusivunimubasel.pdfIn PDF document text
    • https://path.mn/userfiles/files/pomazupo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9b0vl54aetc1gvmckf60umkl32/kuxesetumipimodukiwugetul.pdfIn PDF document text
    • https://drlanda.hu/user/file/38161397395.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/56898760001.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/41518242118.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/54875547778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+are+the+best+games+to+play+with+friends+onlinePDF 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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 18036 bytes
SHA-256: 3be11803a4959c1ef9eb4a4f52a28cf19f813370b1b469ddc832929e08f843fa
font_02_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 11276 bytes
SHA-256: a4666069462a1b31685c8172b980ba268cc46dd0e1f3291f88a4530cb30b1f61

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