Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c8f52dac31228…

MALICIOUS

PDF

100.6 KB Created: 2021-08-16 08:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 4d0b06cc37713af8264a9dc0fbdb40c7 SHA-1: a060799a7fb9165ddd3e12ab9659c6d9fdb5fe73 SHA-256: 1b9c8f52dac31228e597ca44b46141a29bc2be3bedf6d6d646aa561de1dceee7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=present+simple+and+present+continuous+for+future+exercises+online PDF link annotation
    • http://www.kowel.com/ckfinder/userfiles/files/1628549487.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/17327154878.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/senimomelulabisiti.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuzenetode.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/49cc9031763d774f9f0c983700d3978f/jipodokaruxut.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xanepogoxavewubiseli.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lisozuxod.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f4aac3a37---27467663925.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/98618249431.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/talijafoninefativux.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f03ac9fa9---18239395833.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06265c9e---63778637818.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/93352005435.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/26098507823.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/40730236730.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/19794874113.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jovoverixirimew.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/96095557768.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1763c6e596cadc89743df8a56fbb6ea/kosudedasurafaloxived.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/faliw.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/82buvsgp59go51l4tarr59irg0/jivujodotininipisoxijega.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/jivesabevisexakatanakebi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tagedefimevobami.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_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 10984 bytes
SHA-256: 2382819a945d94e9ca975d5174aa1cf23ff590076344dd203532204201ca0356
font_01_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15309 18896 bytes
SHA-256: d99a04ddd162146978f8f52472addc0bc6a7afd8ca52e2aa611455df6a8d1994

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