Malicious PDF — malware analysis report

Static analysis result for SHA-256 27762c21a66cd922…

MALICIOUS

PDF

150.5 KB Created: 2021-07-20 05:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9e3e54e58b5f234be56dcbdf40e21e9a SHA-1: 75b78267d6fc1b40aa5c47e90dd50d0c7fd1c267 SHA-256: 27762c21a66cd92290b1c4d8987dcc196476081b5b691c8507e83042d696f454
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and link distribution align with techniques used to lure victims into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://jjkxmy.com/upload/files/202107200112098862.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/wenisemesi.pdfIn PDF document text
    • http://ipllaser.in/uploads/87804897934.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/53457713721.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2271a204---kakimopumasibig.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282008524205.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekjhdua67ofj772t742klh6qh9/26985920477.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/24681307680.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4f3c64ad---nobaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080a55f0aae7---21926794318.pdfIn PDF document text
    • https://kham.vn/userfiles/file/zamopefepuzekakibelu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/fekavowesavofofado.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gukusedepixadit.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a03aa5da5---62759732436.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3eee2cea1---nimetowawegepesafozanuka.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4e627104ae87a08086b5c706ec593925/tidusodojiwus.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/688d76f500e645ecbec90b98beb279d2/46894353066.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/75836152361.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/puxuz.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/26973356228.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/loq3uhcrinmkqsab3jjg22afr5/40495062440.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078755eb554f---92752546382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hounds+used+for+fox+huntingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EABC 19632 bytes
SHA-256: ed85f7ed748c908f51dd10b7fd59601c6fa476c1f417888bac60563f3501b5f4
font_01_sfnt_off00021c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23482 10620 bytes
SHA-256: b2ef7ab07cbc4e70ed2aa24ebc6a3075fea5b2129e4a52135621a489318cdd94

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