Malicious PDF — malware analysis report

Static analysis result for SHA-256 26588dac2131dc7c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca43f76e0b9644ca83f2a54bf2eb2de7 SHA-1: 8ccdfebfde1109aaa45a50a759a435a3b83e2bf7 SHA-256: 26588dac2131dc7c41249a2a15940626b9fb02e6ba047cb144a35e7738463f3d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=free+fire+max+download+for+android+in+india PDF link annotation
    • http://mlight.cz/archiv/file/kudeg.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/takenomevanaxunikilekuwi.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902025106_ouwf0h.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf6f2c1fe---firigo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/79f02cd93ec193a623570d7dad350f90/xupusewu.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/rowufetuzalasowuva.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/26294248230.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/supapufifosuramoputazu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/nobadategugisa.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/godizunapafegekavatoke.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/puwiramofuzodugarifelobo.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/66400536739.pdfIn PDF document text
    • http://farashimirooz.com/files/gifarozekikutilomabodolu.pdfIn PDF document text
    • http://lagrupacio.cat/file/12793269142.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4h9n5kr6n7cnfi775v3rbdu8j2/deduguxumogipabowe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeevld431gthma17vv0hlhrqg2/metotonumomonifekep.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_762D39569BE55703.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/17838687084.pdfIn PDF document text
    • http://ranch.pl/files/file/pelexu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/95380437120.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xatifotopanodoxomuveti.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/dixofa.pdfIn PDF document text
    • https://digireg.ru/upload/toribimuwopagibi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22dbd1696---naxuwagama.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613607749dce7---dozewezuvupubezugej.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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 18480 bytes
SHA-256: e3217432a09822142b2a69648a52f59e23ac3bf79c7a787597ecdf2b4b5b65fc
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 10412 bytes
SHA-256: 0e2d5f68ebb748becae172cc1a2c31f50234dad17d4c94674ccf0893be79e35c
font_02_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1