Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2172231f21409b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fd9b089b80bb1d3fcca67eacdbd3082 SHA-1: 0f146751d5ea120263f5fa2061b9cca3b1858126 SHA-256: ee2172231f21409b5ab8e0376416444ef20f9778d53970fae9f0598f36c50586
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially malicious PDF files hosted on compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to download further malware. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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://najlepsietorty.sk/uploads/fck/file/kudok.pdf In PDF document text
    • https://szabobuszberles.hu/files/files/84296972993.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/mujobojopagidani.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/jovijozalixawoje.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/balajobuv.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/92023193505.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161485bf73ca32---89527421487.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcfd2eb6f---zevowemumanefurez.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161413934e8f63---gigirunedame.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/61608831325.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/duduwotosusajaf.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/43387221087.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/49909800133.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/maselamadiligebaveg.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wunag.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zutugebepopajiwogivilugeb.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/rafaligewikoviwomijabo.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/15470359694.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wimujexal.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/428501889.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210914112731.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/kosuratubepif.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/medigaronelo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4qcu0o0ml5540m0nfg2rsp0c2/21581524921.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fokasojebenimopuxekob.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4249ad376---71775549373.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/zuxopudipariwubafine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+x+apk+obb+downloadPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 15084 bytes
SHA-256: ae7245db95cb439a897ccd08d234853c64b869fdef5e899a67fbf60c63176995
font_01_sfnt_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10576 bytes
SHA-256: 8e4a933be42c82a87a379758e2d4da89023b15e0cb8911f0b34d092d64c686b1

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