Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e71ea49c80a99c6…

MALICIOUS

PDF

122.3 KB Created: 2021-06-20 07:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 779072d569944bb0ffcbd3b35dd9d9c8 SHA-1: dbdf3c1887bf988a9b6dce6f8ade86193be00265 SHA-256: 3e71ea49c80a99c6d4ecce89279d9147408a4c5a6426189c8f0bc50adad2aeb0
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 0.9998

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8815536882b5ef594ee64f6ba4173a3/kezevaxum.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6fc422c4758b7b6464df2446b176639d/7870457871.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfbb91436---vafowelibemobafek.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_9CA160ECCD212460.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/mekalolujoza.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2023081147---mipavonoxufewopisa.pdfIn PDF document text
    • https://zold-kommando.hu/files/16709395895.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/rubupisosuronivofewoxa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uffb0n1n6j9qk0tljino0s6je8/dirarivenofiwavob.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tebigixuso.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160818403b44a7---4880672365.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6a1d8e7c---46509635522.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3de8a0db---39194567030.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/eb3ee2efc39b3c702ae8943025bef7f0/gebifodiwuzi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f984f158cc8fb35271dc77eca781f6d1/43789088291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dark+souls+female+character+creationPDF link annotation
    • 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_off000186d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D2 5068 bytes
SHA-256: 0295d5d670bbc579eba85b1bf4efe328a2947416b46084d6838524731a8e8da2
font_01_sfnt_off000197ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197EF 11252 bytes
SHA-256: 8a95a7e40218a574837f925e72ab7f1b3867e7956afbc4b26b2486d4e8fe0a43
font_02_sfnt_off0001be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE40 16196 bytes
SHA-256: ed614ff3ac2e387b3dffe3adc8533a73dd514e171fc201cb60d70b5b5a32e0ff
font_03_sfnt_off0001d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D359 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f