Malicious PDF — malware analysis report

Static analysis result for SHA-256 b600e55a702c3533…

MALICIOUS

PDF

89.1 KB Created: 2021-06-15 20:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7705b6eb6ac86210f4d5acb8cad576b6 SHA-1: 1282d6b6e69e2490a4972b3205dc1e2482f3eb91 SHA-256: b600e55a702c3533e5ecea8ebe7771c3778c5444bbadd2ccd417e673a713bf4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=ukulele+solo+pdf PDF link annotation
    • http://princeworldwide.com/multimedia/userfiles/file/24786858448.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5286a5b9---rojuvozigesina.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc4db59d0fd572fd2db017e65cf21986/38264083923.pdfIn PDF document text
    • https://limmaginebistrot.com/file/mopisotojolesubusesuvaxu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb8396a75---91480884768.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/vadigulodosaba.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/takumelutexusoduv.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/ditinabuwurofawepugodixom.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b2d91302bbeb1b8e51002fb8dabf6fd2/bupulagojewogunadafutudu.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/nebitaberovalitinesinibo.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tifafijufamet.pdfIn PDF document text
    • https://lordpin.com/calisma2/files/uploads/45990761061.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/29d0ed83c4f78eced25395eed8247b6a/31859148967.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8268a36fa0---2753407766.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zasovuluzofitosokatopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 4784 bytes
SHA-256: 54e8bf3a9f3a8422e0129213e17fb7b1afc1d8574c5371ef7b5fe0ac30f0528a
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 2268 bytes
SHA-256: e8ae9cf3085ad5f945ef0ad58c64a8b9ddb20ca69f2a4a232a1415773ba91793
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 23516 bytes
SHA-256: 7e4d03d0e6da9dcefd5c7c5829378bca91369dc444cbe4b306fbec235cf05af3
font_03_sfnt_off00013f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 16404 bytes
SHA-256: da2737b2462f5478d76ffccda74fbf7f4580421c169f957846337c07c592f29a