Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdc13e38dc9e3c4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 05:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0ccb04712f061ec58947c401c75263c SHA-1: 535489dab6890a1b3d174882e1afbcec927a3ceb SHA-256: 7cdc13e38dc9e3c493f5fb4d8a870bb9c4085dcd6506e527b92558464a5fbdba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised websites to direct users to download a password-protected archive. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the SE_PASSWORD_ARCHIVE_LURE firing, strongly suggests an attempt to bypass security controls by encrypting a malicious payload. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/485a6ba10ed80db488f809a904f4b2f6/dafasipu.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/95417880867.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/46362826390.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cad28b1b949---radamugenol.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kuzonizupawav.pdfIn PDF document text
    • https://tomas-music.com/contents//files/43632602409.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h19jn6ipu4c37o74s3kja00ob3/97951554395.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cffcf41ac---jigagidejejaxol.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/7306351148.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825483789d1---veromivogakababij.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/48510557267.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/zivobizikururasovore.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/aa92764112d3abccd43f0ddf9667491a/penuwuravafugofeba.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/20362281469.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/nijelajesa.pdfIn PDF document text
    • https://digireg.org/upload/70769552214.pdfIn PDF document text
    • http://princeverma.in/uploads/files/97920495997.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/gomawofuwa.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0019daae---81725259529.pdfIn PDF document text
    • http://faradbox.pl/files/file/67703238117.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsokpho0ovgacprqqgkrld06od/nakutamaxapipamorolef.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/bawitin.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5bcd4a196---85634576562.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1a2be050fb6651ecea158d31a5d4f464/62849907772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fundamentals+of+engineering+thermodynamics+7th+edition+moran+solutions+manual+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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 17388 bytes
SHA-256: 5938459f789947e61298b9284ae0f13ad19d147636ee27f7bd09a6378bc69749
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 11308 bytes
SHA-256: 3a9cdc6f360da3b5b06c8a5aa8b58e1b5cff92788f11cf8bc52989b2ac663ac9

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