Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc14fd71cd24096a…

MALICIOUS

PDF

119.9 KB Created: 2021-06-24 02:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a49920e376705d4d387485702a8978a SHA-1: 85bd28f2211b2887c030ac68534dbf8bd4e3d9cf SHA-256: bc14fd71cd24096a1eed0d9ccc47a982ed2dbbd0351e565504810c777256c1a4
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=general+knowledge+book+pdf+bangla PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f80d8f0e---vekazufukazisivevirepa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0b379179d1cec37168ef6b19ef812935/kigadonanufelawosubidok.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/27775c08504de4b2a37227fe15c0dda8/61291341955.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/26040876648.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8e6ae41---19978827633.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/kmtitgqr4dogdk06o6hrf3v6g6/rowope.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/17016572147.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edda276bdf---lojobasawixupujewa.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h5s7n770tlgd47lvv3jglg029d/12259365148.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092c036cca74---jawarijifipebe.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/68105370764.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51e019b73---vojuzofa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc82c4b5---sijipovapaxaledegunumu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jenpmtl5eru94bmaash8ccl4c1/16933439540.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zozanezubota.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zojurufinusabotoxuzebiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 5360 bytes
SHA-256: 37595d84ef7eae26cdbfda91a0b78f714291698093bdd9b6ef1785b4a77538d2
font_01_sfnt_off00015ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC8 30996 bytes
SHA-256: ececce5d68136d9adeb57e05afb134e7cf55254ddab28e09b788e49c1263ca20
font_02_sfnt_off0001abaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABAA 10816 bytes
SHA-256: b852f1ac8cf4f33df0896f3f3eb042e198f9d0ae7e795568aaa9c00cbb5c8b39