Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d45c1ce913f1620…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 20:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6389338b8f3e242cffd68dc7beeff988 SHA-1: 9782a96519f68306c3ccdf94c0b824be0de00718 SHA-256: 1d45c1ce913f162094557463c79b4e2b2e51b8173a2444603bbb25564e4c9d67
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be social engineering via redirection to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=va+et+vient+2+lampes+pdf PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e9ad93a14d33f1c125e2161b81f25a61/wosumavinubomi.pdfIn PDF document text
    • http://poaglasses.com/uploads//files/202108080357053522.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dulumafegenijegite.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/rikofadugivoruzokina.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e5d8a44e---favota.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/544507566f88b619168c5841f9b495a9/54475362202.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iobfm8p6tlhc12dnstoj5f5qv4/24320407033.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/74012727188.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/pefirelenolorositeti.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/24884425465.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a074ed645c4---19714730170.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/61612718370.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210731_86FEA8C62F0AC27E.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kutegiginidumubipe.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0j8pmbghrk4q8mp9dm7btk0i5v/tuxojudamoxukililas.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8871946093.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddedb4b1f---fapape.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/47264860145.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/patozasomipuj.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/26985198640.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3d78e5e1957d8d973c002e8bca7d784b/negazitowukujig.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gidukupuxa.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10596 bytes
SHA-256: 369b2f5c8d24045037bcb218375dc36a50def78e3a74b174131a2bb13ba40c19
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 20444 bytes
SHA-256: 5d0b14dcac438d7e0a873065ad566df247807b35c07b549c89fe12f3cc61763d

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