Malicious PDF — malware analysis report

Static analysis result for SHA-256 0558348eeb16a23f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 03:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fabf67978691d005e2540669b87f93f4 SHA-1: 80696e34c16b4dcff6f5fdb97a3707f4e9950d8f SHA-256: 0558348eeb16a23fd68b7319c650cc7f8bdea82ec15963385aa8889bf82c005a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or further payload delivery to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pernambucoimortal.com/imagens/files/sijezemugojef.pdf In PDF document text
    • https://ratoempat.com/contents/files/43043631891.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f92340961f2caa9428f72b5e35f7c340/47966558621.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/zijediletarixutagarazix.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/vikejinikinozijem.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4dmm2stv2ksskrmpk38av9cbuf/99508489371.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/15545180718.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/69302055301.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b393810c4---kapilazabixipotawile.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635aa57dcc---42028732694.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/50270073509.pdfIn PDF document text
    • http://gaudi.tw/upload/file/rigoxizefavokamegotugi.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/vonenabekugavudal.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/59442429372.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c02604891---82333917483.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/22394247733.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcedd8550f---32730991803.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/lixajirusawabijidetijuwa.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/biwixiwedujev.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/35437435569.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/mulovujadetakodejitub.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/xoluka.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lalekubutisabavavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+restart+app+if+killedPDF 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_off0000c2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E1 17728 bytes
SHA-256: cc50824f2986105154cffed6dd64b43d36a00c724bc7d2d00ae21b9c9727fad0
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10564 bytes
SHA-256: c07398de9a6da5e98b1c63f69de384bd83c46e245309da4b22104295745e99e3
font_02_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1