Malicious PDF — malware analysis report

Static analysis result for SHA-256 e933a234bdeec91b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 17:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84f3067d2b01d5398e2a720316e66ab5 SHA-1: 7861f4a5f13a10229f6e964f65eb86c21463b28a SHA-256: e933a234bdeec91bad7e7e149c6c63326b41ecf69c4845f75990a6a395812595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=how+to+save+photos+from+whatsapp+to+gallery+android+automatically PDF link annotation
    • https://maytinhdalat.vn/images/uploads/files/71484349144.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/pidazuvu.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/79554805957.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/dakaxopigosulekut.pdfIn PDF document text
    • http://lawngo.net/fckfiles/barurowatekalufikito.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/31100830795.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fn43bblavug8eqr8ktapn5puat/dawif.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/41279197891.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161403bb36a082---tesuzovafemuponedipa.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/1582817079.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/31856369670.pdfIn PDF document text
    • https://wasael.com/userfiles/file/vijemevolupimokiw.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/57477265199.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/82428782732.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/11277gpih9139fog86f22kn9km/tivovozakanesur.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4ae4cb52---zaxolabizefibekajewusa.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/21348582607.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/1281253193.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161424e47749d0---kusibupovajurububi.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/97394887333.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/35604647559.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/wolafapogudojovu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gs8q3arochhfa7fmvaqmk1rj0v/38212823912.pdfIn PDF document text
    • http://tayles.com/uploaded/gamawe.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/difukomivixusemozasikede.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614408241f184---30711092198.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_off0000b692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB692 14660 bytes
SHA-256: 69bbb14824461f8aa8f589dd6b761180f180a3fe983a0a31b2cdaaad74cebd70
font_01_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 11424 bytes
SHA-256: 0c62eb95ee10625a03837555a5ef4d7e32e985eac3ae4361e7a60a7f9dd17f15
font_02_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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