Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d509e506c93354…

MALICIOUS

PDF

112.7 KB Created: 2021-06-09 00:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c376f3ed2d194f69b04f1159a2dba9e5 SHA-1: 72624380249145b6d473b7696a2990921fac23d5 SHA-256: 17d509e506c9335412fb79ee4dae6ccd304013157d7feee2bdda27279fafddbc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

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://philabc.ru/uplcv?utm_term=copy+base+th11 PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qfmfaubu33tsaf4k22qcpaubl0/3693086209.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/si2r698u64lslb52mta5h72014/fenixasad.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0987789e4b---56946217608.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e4e958caa83e351815793d85e548caf2/zewapak.pdfIn PDF document text
    • http://waterreducer.cn/d/files/32993456483.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fa0403d9290299d2c10cce225ca85cdd/mariketowuv.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082758431321---73406356299.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/wafonujuwasutaxadopowiwan.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504131824922.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/38v14s824ffv5rh7avddlqsptu/38605235838.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/9818561938.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/27afc938650c1b4d511549d15fa9eb3c/betizobox.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d31ab1da7db546fa88174bae38bbc2e/fokodu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5917131539---93184024357.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dkv023672jbre4b4ncb7imlk60/wusamukudogixopetekip.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9016aca61c4c0171a426e44ba75e3a98/gediwufixedutijidewo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ptkf0r4oj14t2a46kqugf0nbbo/kokepufogojuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 12116 bytes
SHA-256: 46cf80e4b62f1535f2a58d3af591c5ead6365cc2285d111ad193641946a8edcf
font_01_sfnt_off0001680c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680C 4980 bytes
SHA-256: cf86e79a0920a163f3eb0376f391c6d71a5bf53d5756f3f2f6ef9dd7eb4cecbd
font_02_sfnt_off000178f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F4 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_03_sfnt_off000182ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182CE 19396 bytes
SHA-256: b40d0b3ccc6f4a99c304c3bf2df49ba1d7cdf96b1d2e8404a4f81b961d2a5c3b

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