Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4f748ba2485d9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 11:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa41a13e509fcdcdf826d13b92e37039 SHA-1: e3f02f712bb3722a0b93e231132462e909e5c94b SHA-256: 7ad4f748ba2485d9dbbe651ccb00b4ca071d1775f8ebb2fdb3239ca0e1922ea2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a5692365---kepol.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/89914995148.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/9063114828.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbba93830ba---45886568392.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/wolimivot.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a7b00a2023a7242bc9ffe0078e6fd915/kasubirizo.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/medob.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/ruritukoluwekudadariw.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fca8fbe3246751a2710d4a4a9c92600d/vikisak.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/55ad6f7fcdb93b254695674c68ec37f5/luwowigasadozurizewam.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/toliwufeb.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/78075987419.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bcb341dd---zutewevamepogeruxupulokir.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210624_152041.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/69559514045.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/65787562531.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/gavegikufita.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d458d501a310a8aacf8f3921d703f554/jigijamasanexowa.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/defesofafivavavepujixe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6f0ce5411---jemedijuworukolorililurew.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/kusor.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cec03bc---vazezipate.pdfIn PDF document text
    • http://congtyvima.com/images/Download/niregebijaxirikiritog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manu+dharma+sastram+telugu+pdfPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 10824 bytes
SHA-256: a103583765310482a9ab5172f238a4b3993482d7589ed184c984e69207d797d3
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 20208 bytes
SHA-256: 9774ba74d38615621e4dc1343a74d09a98d4685dfa0d48e820907cb91832a2d1
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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