Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc249171d1e9684…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 16:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68c29f10f2ddd91b0964906db9fb6f76 SHA-1: 8b87003a84cdeef6a93f9d38bf53d1c92981bb0e SHA-256: 5cc249171d1e96844a15515365ca8fcefa83fba2ef61476b2ad604d820698e67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=live+cricket+radio+streaming+free PDF link annotation
    • https://svltv.in/userfiles/files/jokelo.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/fasosukuxusodimej.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360b2d17f93---31507445266.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/36462460427.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/tabejimaf.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/46256042983.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f17a336---80579024100.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/56967616135.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vumegiwosonikopibedowa.pdfIn PDF document text
    • https://bachson.net/upload/file/87230986312.pdfIn PDF document text
    • http://email-database.info/userfiles/file/boluzovopenifizelogam.pdfIn PDF document text
    • http://rafaelokazakov.com/file/mimowog.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dozisivez.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/37438925926.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2f1e9b627e265a851b750edf8dde0bfd/katakajexavaxapas.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/lusubanugudibifozij.pdfIn PDF document text
    • https://ghnservizi.com/file/38658016449.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kezas.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/rewodamirosenutefed.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/16108676823.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/selobabaxa.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/zunurugotujoguxop.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872929c61---zaxawozegibolesebobono.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03c593999---fowanamadavojoputaro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17476 bytes
SHA-256: a66fcd5ade73fb92f07d1b1b27fe189c02e0f979b2476265e0d80261e6f9310c
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10888 bytes
SHA-256: 7d93ccc262132595cafaf18c694ad884cc9550e73e178a7853fa6705329d4580
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1