Malicious PDF — malware analysis report

Static analysis result for SHA-256 222e116c6e7e8d62…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 19:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd49565460d1b147ee8fbe9de8ceff17 SHA-1: 4ca7d79f0be5e97590d2df5a6c9e7af59e6fbd15 SHA-256: 222e116c6e7e8d626f24bd2dd11df5f3c27fd3a948cfcd974b93a3f7288aedf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the links and the detection names point towards a malicious intent to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd42f0e7a---votebu.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64462fbe4---90838882023.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/18196409279.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xetalenedidopunuxid.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/bafoxobasegitubonizidev.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/25429441090.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/milelow.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a970bfeb---remofe.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/bepoju.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e5a5d0ed847f0ab0f951ea804c54b217/tikevoxumuvefa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160759e24e8da4---16459382209.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rekijufogamonuwisewiwat.pdfIn PDF document text
    • https://hojoairport.com/images/file/1396443020.pdfIn PDF document text
    • http://evola.it/userfiles/files/85616749551.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb79e90438---jedakodefizesolu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c91342a7774---sikuta.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/69660092759.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b166e3f81---nanuzawonaxafivatubifur.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba9c9393e---65974154437.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7e1c3891---juledikubulumidovojasufuf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd4c68bba5---vifatonibiredeveg.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/37nl6qhqh2fdgng8urs64euejh/12332195538.pdfIn PDF document text
    • http://2440027.ru/upload/file/xefig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gameloop+free+fire+updatePDF 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_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10524 bytes
SHA-256: 2d2f5aa8fa20094db129f70fd3b7ae31e63c7fea45ac5dc892171de0dad412ea
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 17380 bytes
SHA-256: 1a518fa2bbd7b60bfb8a6dadc2768a9319e405c93fcb9ce7288c31ccfdd563a9

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