Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26df25e7abd355b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e99327d5c37f07130012fc8db366cfbd SHA-1: 7b200fa3744f7a7842269ce00aa60b305ba5c8f8 SHA-256: b26df25e7abd355b2d459003fa7b5ed1b1bedf519f1bf75342f73bf4d63d6665
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=addition+within+5+worksheets+with+pictures PDF link annotation
    • http://ceskylakros.cz/userfiles/file/6239775493.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8ff0ae59---48235414277.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dixanapineverad.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/zobagilunurav.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77614301971.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/tutulonelefoludigi.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/21514519807.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879f8cab201---ritigubalapupirupa.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/mikemose.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/joragabesojuwunasav.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6ab220ebde8b424de5c5bb41aa34d170/30096766516.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/73b032737aff454e6e1b3cf37585957f/28172779939.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sumivevimopamurotikif.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tobobumevelosizi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c7484e25---95974273349.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514e8bcbd---75007277782.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/dasawudobexi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/75009311561.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/libog.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ff417cf99---zibusevanidimowupaxuzaf.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/sugubakalejalaj.pdfIn PDF document text
    • http://indel.sk/userfiles/file/93694459847.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/va7lhtinape2igqrqk6n706fc5/tajufowomexejifefawu.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/91341856302.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/al94c5e9hdq3iolb180h8qoc8u/55752908014.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb145c15---36706363552.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7ef675a5136eb8edef03bb1d189eba6d/79012871994.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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 17720 bytes
SHA-256: 8beccfafb4e42d12f96cf20a8caaa9ea7cea8c851351a468b5fdd4afca4db2cb
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 10796 bytes
SHA-256: 6e35bbbf84af875956c430053e9e1af91e52cedd45f01ca1e8e0ae7037e5effc
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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