Malicious PDF — malware analysis report

Static analysis result for SHA-256 51890d09d9d2ee64…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 10:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 17d62c7c4c1794bfb59f51c1b70def11 SHA-1: eb30d0dd55eced571624d3950d0190da2b9730cd SHA-256: 51890d09d9d2ee64f7ae3ebc6627d05eef9e80bfee9006e5112d773615d44d06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious or phishing content hosted on these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wavanesukurizunexo.pdf In PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kitosi.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/37229288324.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6055ef45---nopudasanideregol.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u5gccvnjhtun10bqd532a5m1ub/gumasekupusojav.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210621181656.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61f057dd8---44117850331.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/77726225836.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160721df7109c5---69047914799.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df4a8e8f8---nukibepez.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30afe97b86---2969720691.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a738ff4e60d---24468943726.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210707_001052_8225.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9afbf336cfd84e9adba0a9fea349822e/potiruzelatedili.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/92327100824.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4360cf30---zoparobapivutew.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/nuvaw.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aed73c5cc07b63127b9a0dd511c38864/89713617625.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210ff601ac---63914470888.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607114997d2e5---fademipidekobosil.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/3186277650.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa05d291d5---zagok.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/97411071180.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kexinurozu.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48688811380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=directed+reading+worksheet+answersPDF 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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10780 bytes
SHA-256: 6e121b3b3b19040061c2dc2f31d532b4eb52420b952f0ad2d27c183bf6762fd9
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 17220 bytes
SHA-256: 1a2a136d5298eb5be9639319a5d53665f026ca43024e9c421710d09e799f58f5
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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