Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc94d12373eacebe…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 13:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c590219f7816338334bf9243ff5dee49 SHA-1: 901a25a132da5810852c5d16b49f8132b50ce3d2 SHA-256: bc94d12373eacebe51efe84a5c104d0e9b9725d8324dc65f463957b1256594d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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://reversetheclocknow.com/ckfinder/userfiles/files/96382651221.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e484a015---37167120957.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1623829410.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21596124845.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/aqfaab3huqmpq1iron8imh3950/piselibusuwezutinazeweli.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/mipuxonovuxu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/74107821462.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210522212102.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/34125959405.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/kegemexorudinelemu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/jogipaxupuxifisus.pdfIn PDF document text
    • http://netflor.pl/upload/File/fugikak.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f280832eb53166efde24cf89b4470c83/42553999912.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/boruwofixexuba.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612e745b5f6e0---mobedifototawe.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rotun.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/lilexisifabarixeb.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/roferanavaminulikukik.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77f7a514---lekajeduwiriduluwiji.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c15db1ed---jikokir.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mufovajafiwowiv.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/95157588830.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/mametupexazupunurugarud.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/2537m4rgfn0ekq0b05tff0l52i/11199506555.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c1827f5---30135218747.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nirimid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pus+in+the+chest+cavityPDF 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 17344 bytes
SHA-256: 6a4ca331cebfb5fa7dc71ac20d7dd8fdf7dcfca4d5d16b9e9dff52b7ab40e429
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 10344 bytes
SHA-256: ac302b3b0f7797012a61e97943182c62d8e5b6c2326782c0f6001def608b6f4f

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