Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9729444da5e84b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-18 07:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11559cdc6dced566e7a078e28f91c57b SHA-1: 17011cdf9d964a1a2c30d6a7ff94af5efc509dfe SHA-256: 3d9729444da5e84be4f4749359b1fee09da030195c3ef3f6ab37424de45f06ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=ron%27s+quidditch+number PDF link annotation
    • https://vnnc.vn/img-hdmedia/files/22399172897.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/44163266946.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/movubuf.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fufipumotemokali.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/872f50655252c7395d6b44b9a65debf5/tifobamobiga.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/naxipaz.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/58692929171.pdfIn PDF document text
    • https://razredna-nastava.net/files/3814869519.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130faa523866---waxerixogaral.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/1120630807.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/23316068187.pdfIn PDF document text
    • http://armanetti.com/images/45009299748.pdfIn PDF document text
    • https://highrise.pl/file/7026344884.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zadadefubire.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e02901cb6---sukoxe.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/55197650023.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/46894010597.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/todax.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/21298142719.pdfIn PDF document text
    • http://bscartridge.com/pic/xasuvoniruduzeroweso.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/buvenime.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/70771202921.pdfIn PDF document text
    • http://synhbio.com/upload/files/kirokafatejevipagabago.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/paloribixifuwo.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 17704 bytes
SHA-256: fe2cc63512ae90d677ba9aaa6a11f73f788a92e5855de403bf9782600df279f1
font_01_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7C 10892 bytes
SHA-256: 6ad40eb9d46a0002ebc9a08257ce93232eeeabfd0c501920f3504157c737d027