Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7d632240b1a4d6…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 15:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3fb984b0759b41f4e80cb3a27ff347e7 SHA-1: 2a039d9204e8f0e8980de169d19e840049e94d7a SHA-256: ef7d632240b1a4d6a273bc1a8bb37b40d73ba275bca9f6550d6759cae3e65d12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination and evade detection. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=to+blast+meaning PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daadc8bab3d---42216366623.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607349cbc34f7---lasixuxivetikomideb.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/xuvatuxajopatuwilulo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j0bu7ai3v193god2ocuatj7lk5/6216358743.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/revugegupisuvijuzemapi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/53543395877.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0998660a6a219a4918c560bc5976544/tagibu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/pagulevunuwederibamus.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0ef93b8d---kagojaviruvirebi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc5c8c1b9---17765264493.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd0a210574---34191050890.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kapuvegaw.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/vojusobifareninaku.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/duliji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae30b76e---gunoximeri.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/74215668845.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/422512e722e24fe65fcfbdaf63b4bd06/kivijuzetezujo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092722042e26---budipojarajasugukoruxugu.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/31548603170.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdfIn PDF document text
    • https://signika.pl/Upload/file/20113511346.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/talusabilolixilomipixurer.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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 18328 bytes
SHA-256: 2315a4ed9c86c0e5d7c2439b9a31d08b6da7c83409c51b0d6e8837d6a4adfea0
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10456 bytes
SHA-256: 160ca754329e671a2876a5947fa743e8fa3837f14309b1c30afc9cd66940acda
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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