Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8287bc5846b9cc3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 16:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01e96b4d8641602472527b367347762a SHA-1: 9309fd088b81e9bb9d5fbb3bf6dbf30392235370 SHA-256: e8287bc5846b9cc33d411946b4e61c90c09c9be2393d7c962921571da641b76b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to obscure the true destination of links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=gmc+yukon+xl+2016+manual PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160917b183fcd8---xavaku.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zudosazumotulosijap.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/83288149567.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268f989d6d---nirifosogopelivujuret.pdfIn PDF document text
    • http://wohingltd.com/userfiles/koreboxezemelupiden.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F6D526A2C6E.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5205599d2f---68598148912.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc463aa0fa2---14252024753.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/36070120616.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9217be41e5---4257247448.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/30317792497.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9c395505a55bd1817f4b765eb66fd858/54806901075.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/pilopufiwiranotutufuzizo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d5d3pt6bmo7gebp3aov5j8e4t3/44690195309.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff551e1b9---36729635554.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mapanidagevupi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g6ibpklven2580agauojncc4im/nidofofotuximulo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96dff3a68---23283219156.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/nuvuzuwovamorokeloganow.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070416245573499.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb8228544---44398852110.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84437e133---rusotunipurulivipixamim.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/najeligizigugago.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff73fe1834---79793064428.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/78855066188.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/73b26b1cce270664180761b0603e567d/rutikikavuxabuzudu.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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 16544 bytes
SHA-256: 6a0b57e57a9282b1c084688ba479d24d74cf342dcbeab1770ab6a6e4a78ad35b
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10708 bytes
SHA-256: 76dd293def6cd0c40315d76b73795520db4445bf81f49b7e1585a271bca6e6b2

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