Malicious PDF — malware analysis report

Static analysis result for SHA-256 250a6ebf602ff850…

MALICIOUS

PDF

87.1 KB Created: 2021-10-08 14:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c6914c25b4951d9de3432135027995c SHA-1: 036c6735ec4ec22ab7e180ec89929b556103648d SHA-256: 250a6ebf602ff85049a5b45b5b3a0ecf5cdcebda6c58b4f62390ac0428ba1f86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are common for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=phases+of+the+moon+worksheet+pdf PDF link annotation
    • https://damsindia.org/admin/uploads/file/3770156569.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/95901204359.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772bc25c82---gafimikaturabakozitaxog.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/76911087067.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///mixeratonow.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161522191c5f5b---xorimedunaxabopu.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/74636939450.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614c72ededacd---11291798187.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c62865256f719e04d0783b607e1820a7/ximalo.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/95604837817.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/36832933185.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11024602309.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/45804485326.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/jikokozipelabimasabas.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ximegukefiz.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/25370591126.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wadofizaz.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/91334067785.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/bodixumijapopor.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/58508802498.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/61689469699.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/dikagigo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615453297f879---biwirenaja.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/45112396856.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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 20808 bytes
SHA-256: 031949e316a9dc3fce7198efb7cc2d8b65c823ad0f9d25bbb9762f60118b09dc
font_02_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 10804 bytes
SHA-256: 50c55bb314499a81c32fd29bf82c42f945d07092349187c8cc9bc40eb3b406ee