Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e94dfb937f706fe…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 16:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06fa8b42fa6df35cd0c8d00621aa31ab SHA-1: a7033696f081a043371904c30eceae2c129889de SHA-256: 8e94dfb937f706fe92b678de75078560d260508f30e8b52fa5f50a9a76c7965b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress sites, specifically within formcraft plugin upload directories. These links are likely intended to host malicious payloads or redirect users to phishing pages, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0dacbbd0d---xatapevej.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b966fa3af12---motize.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a2c2f1d872f9709dec7f8ca1df1c8987/39868511180.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/bajukazedakiteta.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/11510009735.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d375f264136---xedanogonibapebatetos.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88229a638---sefisenatanok.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe7653071---buxafejofenamanubazu.pdfIn PDF document text
    • http://sivam.pl/files/file/mumumowal.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/iqup3e45p4ti5d9pouln4r6tc3/33821735021.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/zadobujufuviba.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/829e3558035d415e2027d60d9d5c521b/wogotezuduvom.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35824537732.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f932d59cb27200946832d1c898bf7c45/duzipavigakisosoxume.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f1536bd2---26381351246.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/genovafunubunutomuma.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7505cf44c8f5d9729ac3ecaba55b0213/80117269535.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7618d021---vaxedivozisufipuz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ucnfdoptq3lp9g5t01hj6ec8kb/96741384208.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vesepowanemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=basic+coding+decoding+questions+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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 17772 bytes
SHA-256: e0f6e2dbd1a8138f79e198d563cc2ea740f367ed204cb04c2e8b3f328a2ddcf2
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 10948 bytes
SHA-256: 17b509d2d1b552dddddc84b15fce3fc1b48986a3429fc2637a4b91dd8dd02a77

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