Malicious PDF — malware analysis report

Static analysis result for SHA-256 6593ad36d79c6c5e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 13:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca66c7140c6c1b02f20ef67028659f36 SHA-1: 2e0b106d407303e6830b07ef21f53f008aabb08f SHA-256: 6593ad36d79c6c5ec34fca4432878c12b0c2c1d9a6307e2f4dd6eca7fd362e39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=007+the+living+daylights PDF link annotation
    • http://geostudio.eu/userfiles/files/jexokozazadezetododafolif.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f881029b---rifolupinoxekudut.pdfIn PDF document text
    • http://proxima-design.cz/files/file/paxanixupexutozivasinaki.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0vdj9cq45vk8qugum2lqf56p56/janaserefebu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/takitijoxeseweviwi.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/rizemaka.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0daae67d0---52534317785.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5bbf9f822---7319186148.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3be9e570daf9bfadfdd29556c63b21cf/lufazagumikuvu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jjala2ntpmob7ds1eqmp5qsr17/89897508873.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160706c96dc8bd---wojipurebilovagunixa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8bbc880446b5fee58e27e98448136b40/84280139686.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e2f3f302---52695044037.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5461f46686---sozirevuso.pdfIn PDF document text
    • http://uamarkets.com/images/file/36547928270.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/96441814159.pdfIn PDF document text
    • https://flyags.com/editorResources/file///nixawefude.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/99080624101.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/morixaluwijukesa.pdfIn PDF document text
    • https://latework.cz/soubory/5379657087.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b9085f2804d3e3bba57b42c33289cb65/85938266814.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210629171453.pdfIn PDF document text
    • https://akvaguru.hu/user/file/fofupezitefoluxodotolejer.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/95d7783f7f8b34ef419cf67bd140a921/65517006520.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

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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 20984 bytes
SHA-256: 032aad4e68b360122c7b7538fadb1ae24c0ef3c6317405f402bed62a8c2db1f7
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10564 bytes
SHA-256: 0c73cf5980d81df554040ad29b634d9fa40f47078ccd34549a3a12179c166210
font_02_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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