Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91f1eb52cbb8c98…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 17:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896466c29b04610dbffd131c00905a12 SHA-1: 5f6dbaed718c470d1f3ad91b354c9f9dcfd839ff SHA-256: f91f1eb52cbb8c989778dda5de253dbdae4f2a5bbeb69f9c855a835341d2d06a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=chemo+watery+eyes
    • https://anpheatingandac.com/nbloom/fckuploads/file/85150408104.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d860e0a624---94962817182.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1806c51b3d873c55f4900092e41af4a3/dutixofesowib.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b108e05a38---nanara.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efc322258---dopaxixevixepuniri.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6568b58d---poxubazisusefofusirij.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2nuve527ulaujb5hcledcsa0uc/59646604655.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d89e6fb12---sowexenoritefopubobediluv.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9671054ad---pisasesagiluxu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef9b68be4---nonivukifarejovi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c03b073f4cecfaa415f65e23c3050961/76529661559.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3d839365---43541733329.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/68fd32de860af0a0b081751261d688cb/23540761190.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076daff70511---98463535333.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210603004305.pdf
    • http://murasakijr.com/uploads/files/72450044705.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2d8d3c89559b5574f0d552200adbdeb4/jisozuxevet.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/df4747d581163a7a456fe8abae3ce821/94359481911.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a03101deb54---merovesi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b183c4f2097---feguwogobusetuxup.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/43cf231d35b710936eba37f13d0261a6/43998345496.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4867658b---xapunezurakaxibidutifu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b3.bin
1999daac02b8172e669934c27a643d21232e33f38993847851b7c809aa7030df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 16640 bytes
font_01_sfnt_off000114ab.bin
002a83f461bc08ed804ea1409a326949173b2dd0ec2c67c8fa493d3e14115669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 10360 bytes
font_02_sfnt_off00012c3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes

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