Malicious PDF — malware analysis report

Static analysis result for SHA-256 d624096eb33504d0…

MALICIOUS

PDF

110.0 KB Created: 2021-07-25 11:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a3d2b414d9757dcc7f3d4b561610050 SHA-1: b8d562887e0aa93cd412f9d693604dc3a2769fab SHA-256: d624096eb33504d076bae4d8c919a5d725a213a60e8943c83478121af3902d15
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to deliver a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirect to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aimara-bg.com/userfiles/file/zadilimugux.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/75624008512.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/65916824502.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/88034544289.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/88159141140.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69d8dd7d3---75006070737.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/88920138802.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lawudomosikimav.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760750ee2ce---18653939878.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5han5dbj1btu0qabnn5it000t8/jibegarekefu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3921c28c7237517dad715bcc28d953e7/sizubagowejum.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ac3d5a210655d1ad49359e5682d09722/gewufoguses.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a7d1927c1207e1063e52517330748626/20447511948.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8f08e3aed722bf023ab16169bb9da82/6439177954.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d993c10893---woworap.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/topuvikedu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba79e48c24---fuxosunoxatojuni.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2f2817d9---6082417625.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fujiduwotavu.pdfIn PDF document text
    • https://masihpt1.com/contents//files/mujasovedolofakimovoku.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099808fbb991---85908400321.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pakorupawofiloxitupeve.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad896477b55---44652238472.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/dosibawizitizur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ad%26d+deities+and+demigods+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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD6 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5
font_01_sfnt_off00014f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F03 19272 bytes
SHA-256: fb77de707ef56c44d3bf17ce55eb3bcd3bc0dfa13a6341a55d3a56a14a544914
font_02_sfnt_off00018145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19952 4004 bytes
SHA-256: 7f5ae9abbc9664fba838440a7635c658fff5f29a59ecdc56dc84804b0dd844fd

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