Malicious PDF — malware analysis report

Static analysis result for SHA-256 180433aec9edf53f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd52f3c2eb1c12ad04e5c2a011afe2d4 SHA-1: 450e9979202822ecff0f42ab50cb05271a1d81d8 SHA-256: 180433aec9edf53f85a835ab1a896d2f46b62a106462ab9a0b95b4790cea4e81
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 are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://krisoc.ru/uplcv?utm_term=among+us+free+download+pc+windows+7 PDF link annotation
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df8b68799---natibavixaturi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/75504146159.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/33199016861.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd4710634f---peninafawuwilarez.pdfIn PDF document text
    • https://taperagi.com/contents/files/remuxifokek.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210911155542.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99008160519.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/23841913503.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/12465914583.pdfIn PDF document text
    • https://micsys.in/userfiles/file/wibodajajodaloxofonemuna.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lokinoti.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/17153903827.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/josufatire.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/kipetudosoxesusuraruw.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lewisenasifevefijufavorub.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/novasimabubaxulononoteb.pdfIn PDF document text
    • https://polaria.cz/images/file/88154288518.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebed470d5f---21153948817.pdfIn PDF document text
    • http://chieucoingason.vn/files/fuwenatubibojamitamefafab.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/47698522596.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/genuletebe.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/99323642008.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306254718901.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_off0000b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C0 17016 bytes
SHA-256: 0bd99838005c85cd3731ec94e3dc913a4111527af7b99ba365357c37ff19644a
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 11084 bytes
SHA-256: cbf2e8b9724648c0f75432e7181b48adfe877ea69f82fe20d5e762f66bbf09fc
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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