Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e8dad507907e01…

MALICIOUS

PDF

79.8 KB Created: 2021-07-15 10:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ba641c7e4a7d743cc9f33acaed2ff10 SHA-1: d580a2426bcf31df6e4ea57034c53168362ffd05 SHA-256: 17e8dad507907e01a372976ab5f1e33ebd9043920ae2a9b9ec3fa47ae1375dae
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 0.9953

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nb9tjfi9uivnv7s3auvqs5vrn7/27749067858.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/nalezugad.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf75d93ac---zonavudoreg.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f0a8904549e82a3d46a2427997798cdb/benisojati.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bbf469dd2---46371885126.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/vazevikogevuwexomorix.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609839b77981a---xurepitidenelufawijaj.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0405ab5b---82183505505.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1838d2b4fd99068b0851dcc710636263/90427731787.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d069ecc1260919fcff9724bb9c41a8e7/6073956980.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/20b75fb6660420309a699693ecac9778/88737857073.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609094a844e54---dajiwogujanot.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/51291589210.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c73aa173---14732410071.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fafasuxejeneveb.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeab3d90b4---49644444164.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2f261070cb85b837a6feb541810b5b43/vakafafigiruteje.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9qegock4pf04p7i9igi5irf4s0/mosebanekonozapur.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078d18f7bc5e---98982674443.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/332689042.pdfIn PDF document text
    • http://talleresjpg.es/img/file/joxujaw.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3mb0lgfb0r8in0b803rojtngp8/26060937566.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fuvomutosajutuberupalega.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kt1o1a3m885bispi4ose9cgs4u/sageridefezugusolidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ias+papers+download+pdfPDF link annotation
    • 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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 17368 bytes
SHA-256: 80fc90441a411a1963a4c948908aa7b7cb2783883d3e4eacecc6a14734c27cc6
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10340 bytes
SHA-256: 3e442a93e7e59435d250b17fc67213b789dea011fa69da6ddf6a9ec7a6157300
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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