Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d18942b5e1f92f…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 00:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29ebd6739b990d0235a787abb5dc7f2e SHA-1: 5b6ad59e31b8f9a59b29863d18c8b7143165ca49 SHA-256: 23d18942b5e1f92f6df0cf6774d2f4b546c8f4f4775180f0bf64a412faa7869e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=candy+crush+jelly+game PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fud0v76j9jsra8fbcloge54d62/paninuvudolefof.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ac811ba53a8b2a94f25a77f55dee4694/gubagewujukonumaxukud.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/irc5k15sdjqcufotl9r47mlu51/papediguvuxedolazek.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f53c3a3c---37921543343.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e98e104e---31467524288.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a0a8ef6a---71080895869.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cf13b1f2---zufajupo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/307b7869ca53aa599fff5112bc7e695e/ruropu.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/71763736943.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8n657mpsnt96il0sf7nhqou653/56966511211.pdfIn PDF document text
    • http://rld-carbon.ru/file/53582952767.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/zaxidakazipoziwad.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/62rbctvtth8vatd7bmck59id75/65779737963.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f797ec19e---56711500488.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/003e3039e878a8108c79c26c49ec1a7b/jomibipizatomareb.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/13ans0dk2qq9gh5oel0ssn7cr1/76233741662.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cftf4s7qogahalh3t5jccsid27/jupogabobuvegixiw.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gazadizasegelavimatamiku.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081692b12928---pivisawamag.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2e951747528513c97d81630b69f4de20/57331597238.pdfIn PDF document text
    • http://webbuilders.com/files/file/11382740463.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f4486284---rupisulutonibadaveniv.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_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 17692 bytes
SHA-256: 7c8a815496f4fc0768a2c34c2c5a5f4ddcc8f88925192cd3b6ed6aaa90b8b399
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 10880 bytes
SHA-256: ab0b53f39b673a2cc78a1705ae770698ca237939df87e6152b2cdd2a405fc1e9

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