Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b1060fca2b0343…

MALICIOUS

PDF

97.1 KB Created: 2021-06-09 10:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aefbeadb580a0fbd2cde4ae4bdb8f171 SHA-1: 76b5744442b783e70a7d9c3eb7d694d8de9e3f7d SHA-256: 35b1060fca2b0343267020d500cf4784ed87f5cc9cc5d1d20becdf958a521c9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=hottest+tiktok+tags', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=hottest+tiktok+tags PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a950e4bfc---66668013996.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3feb6896---wabosuketi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f1a3898a---wudepe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j72loh2pgvpnq529u8ul21rua2/2465417972.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a181b6ac7d6510274c082d399a303414/51960470642.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/21119479950.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkdhfepadfbhst46o7ihet2qrd/16416710203.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kizaxadito.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/90971243834.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h2a25su95gldc0vop7i2lpibon/ralozefepiz.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l3hr08cgucm2utgh1mjde0u51n/gasofamafi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ad186f54df04438fb5542935372e7688/fipiroguvogijamam.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xoribemarutajafegawuziw.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/rakunumagox.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/535ba31db0330649092aabf2a86b652b/14828917203.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/13100ba308ef7b5d3d6dac064e850ee4/pelejagexaju.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e7ced8b40f93d310595e0a9f17b3b7f/zejupavototo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079348647aff---topipomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn 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/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn 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_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 4752 bytes
SHA-256: e313436e82b0792408f51a85aac11819905d9d14a3652a81a23222fef0962899
font_01_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 8736 bytes
SHA-256: 30156578ca59d77efc5034490e85cbbc6b1bf2dfb332bb58d00a18412f31753a
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 12564 bytes
SHA-256: c6382f7a2d49c0c1f5974a439a1515c3f2f20f60d04d5e2aec16451c12e92ddd
font_03_sfnt_off000160fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FC 16568 bytes
SHA-256: 8522020320e04e284c4315086cb258773df51d6989a2585a0711d05a3582df8c

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