Malicious PDF — malware analysis report

Static analysis result for SHA-256 c735a67e15d41da1…

MALICIOUS

PDF

127.6 KB Created: 2021-06-24 07:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 00bb335570a26f75f82ed4eb269efddb SHA-1: 6086086959010afff288a1d21a9d5dca240c87ab SHA-256: c735a67e15d41da1ca964d10ad0d8231dc4d3432b2b66b45ee30bfa5ea9fcdd3
154 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 0.9142

Heuristics 5

  • 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
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02e92fe3a---mositaxivilesiwab.pdf In PDF document text
    • http://fapannimario.it/userfiles/files/fexarawidufunudofegiwof.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/aa07fe1df496c6781a055c0ef012e05e/nopefenirewezas.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/nceh96m5b2lo3g39utorr69fnt/puwufunozixipamajejefu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rgihme4ccr5bmkn8q7b2n55uob/15260531325.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vpmh28fn98f2rtbcmib427hrcl/15650617408.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/kowinafogefedumekefiso.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/webogolu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/94295802391.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c9751d33df11d21caed2e6021c6df00/38132197314.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/bulobemomepavule.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216c062d26---lomodotabipawux.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655525b8eb---lagagosememanizuvusawe.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/54027687413.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dimafagowajabeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+walking+dead+season+5+episode+6+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B09F 5508 bytes
SHA-256: 1f7a39d0ac7216387fd7df4e91187d21b202b253fcdc4eec048058a81474b94f
font_01_sfnt_off0001c363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C363 5660 bytes
SHA-256: 56cff807c31f7ee396dafb7c941a2b783be48aee2b818fd223145060b3d3d78a
font_02_sfnt_off0001d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2F7 13284 bytes
SHA-256: d43860afa197063e454b821d8d6fe893ce09eeccfd02fdcd36c746d077e82469

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