Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4aabebcc64aab0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 15:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0d44c7de75205e31a08c77c60efeea2 SHA-1: 4905202c80824b7cfd7d0182493c58097d547e60 SHA-256: ba4aabebcc64aab03494a8ed324292848ee869ab56b28827e6d955df0ea94c29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=chemical+equation+for+alcohol PDF link annotation
    • http://francescasciortino.it/userfiles/files/20661622204.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161311dbf6ed78---62128630230.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vipesidubemunebokafapim.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c7a60e21---susebaf.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/fusexosotepil.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/takawotusaleji.pdfIn PDF document text
    • http://agilesolutions.in/uploads/94161890032.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/74232592200.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/02142adf586f37c1de6991f3547727e1/76665228766.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354baa1d064---mevefifivebim.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/93831736430.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/ravosufaxadudozibezezuged.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/mosodi.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/xutupiwirafagademazopud.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/93786827670.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/13535198469.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/22065389627.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/26804784749.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/18368949671.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0708418885c4e4aa73660c134bea646a/84311735655.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/23922631497.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kojurepidudowawapatu.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/fasubuwusevevowakas.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/29346202679.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/wuvidotutux.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kiwapidedufodas.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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 17520 bytes
SHA-256: 9a54be994ff702dcc6d0af450174a9bde4ec82b7d9005fb10620ffa657ef1af4
font_01_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 10708 bytes
SHA-256: b41f1bb779a3480d9d96004133d02df345bb77325b0d90ef7afa4f732834e8a4

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