Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7f99420f0e25e8…

MALICIOUS

PDF

112.0 KB Created: 2021-07-13 16:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6db53436f7c8faf844dc27f48ef7b834 SHA-1: 8a63c70fa2a212363ddfc94227294a117c5cae73 SHA-256: bc7f99420f0e25e8d6035c48285f2c3a1acf75ae2f16dd5b2d23ece0c0fe5cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, with several heuristics indicating a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kitapkapla.com/upload/ckfinder/files/xekulevurutekujemig.pdf In PDF document text
    • https://chaplains-camps.org/upload_picture/file/63587585473.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/thj77cbeql65o86t89i0b2juh5/56434169511.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/sanediwememuximowos.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2f81e780a1fd92b99d29743206981316/32536829799.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/155e79ea150a30ebcbc5295f07ceca1d/55820785084.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lerufojamakadunaputut.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssscldnl3oqbvhrggbakd7vvl0/nevezowutatibor.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/58c36e11eab0547c8866a45b74d2ee20/82260351947.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983961ecb82---kuxusabigo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/62021025921.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/tifevadomoxunija.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e3d45d7d---kuxavamokepuwele.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gowonexotolunonizumawevam.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafe4628180---gupivuzujarifu.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/vujuviwonomedupiba.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/77183720761.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lodififirupuwavuvururul.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f14c3d6a---luxuj.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/pezefamatov.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/tosuwoxezuvezitozisapaw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b3rhv30rteal6r9r470ujhlp8t/99127915829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=frosthold+wow+serverPDF 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_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 20892 bytes
SHA-256: e62cf76f81af8adebe705391602ac20b8439e56b2a2f545cb72b8e2141e7d46a
font_01_sfnt_off00018424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C3B 10116 bytes
SHA-256: d30614d75130fe128f663dd6338b120b4945b3f2392b505f305bbfe8df250015