Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ec15fa5753ef51…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 10:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eccef91f3b156a321f7633de78468378 SHA-1: 3652e8abf3966a4fd1ca712c2abc70ea2baf5b62 SHA-256: 56ec15fa5753ef51d9219ecc07d3afcf44334eb3f682369922f27c7744ac2692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of link farms and the detection results suggest a tactic of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5c725f28bc49cf24dbadf08fcd722c2f/9544501155.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2900a52f34---27693052863.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/24b02973e6ed3e30932aa2b0b958dea6/kilenoforige.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea33e594f---91377062769.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/vurilu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6ijmmvribqmg4f6e5beogjap2c/lulagaxiwidejaluz.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/pubagenimolomijibil.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/nuwevadibupapu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e71kiieppifn0lhi2c4ss209r2/87564817335.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/69686587699.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202108152111109738.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dbae00fec9cd9a9f0fc758a72d54e351/87542385755.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5ed65c3d5e2288296e1131df08f49a1/25158948511.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lekuze.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/fanubumivowovoxitij.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c0d72b1---vovobepusekupu.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/68483113352.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b41ba6d3f---rafanebotelisar.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/246b636319d34e49b7e209d02b89ace3/ruxobu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8503123358.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vmr7s7dp3c0ko9s4l1hpv81384/xunasuzuvipisawanipo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pr4ks6bn7udu04pna93q6nohsa/67694725211.pdfIn PDF document text
    • http://roocenter.ru/upload/file/72529551342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=combine+image+to+pdf+converter+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 11032 bytes
SHA-256: 47649b5413b27ef78a92a0efe95796e24956049c23a73b85e6b928ff5a0776b6
font_01_sfnt_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16548 bytes
SHA-256: 99aa15cd4aa5eed3fec85f59107aa0cf398b9d421efe80551ffc7bb4da6e8442

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