Malicious PDF — malware analysis report

Static analysis result for SHA-256 a777f67f5551c79a…

MALICIOUS

PDF

86.6 KB Created: 2021-08-25 20:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec5f1742a206b720de32fa5e02c447f4 SHA-1: beeb91ce259d2a8e4300c168b810a3404fe1eda7 SHA-256: a777f67f5551c79ae80deb4bc314df8806108504d3edb8dafd889d223f4fef79
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://newoptic.mn/uploads/files/20743290289.pdf In PDF document text
    • http://eiak.org/upload/editor/files/24871325390.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d3d7abe236fbbba44afdf17c593c4b31/vodotewura.pdfIn PDF document text
    • https://susta.vn/userfiles/file/95417712065.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/45688196798.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4679c399---38122301808.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/renez.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/91898195025.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1642448e1---59261611165.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/dizejabovakep.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b85537e000aacac4896d7ea034fcf888/42750943621.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/050iukm1sbpeadqrs31utt1aij/3986090350.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ed9b5aded84---lujirutifugopijazalixetun.pdfIn PDF document text
    • http://abnicum.ru/files/file/83734471753.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/18668069928.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/tawumipazekifixifokejefi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9494b8c5f5---kerofadered.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dowilemofonalijamowumulen.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/93359919394.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebd49afe3---42892687758.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/33806802776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mplab+xc16+compilerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10620 bytes
SHA-256: 0169faccbc39c9dafcbf17ed9044e30afd07df735f4db53fc056a88080fefceb
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 3716 bytes
SHA-256: e159e52abfb7972975040c107c36236b92071f1e94c2bbbf82c22632533aebce
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 18184 bytes
SHA-256: e00c25e51c31ba51b177a0d524bb37f4bbff9bfa443ca9d3e6c6ae11429f30e5
font_03_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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