Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aa5579abd69951…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 16:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ca4235c45b8113693977c3c05e03f5f SHA-1: 51cd9aeb2b5b7e2f8bd4c90d5c3a0a8c9f488438 SHA-256: e4aa5579abd699511d7298252702c4ffd38ceb3981309847272b3fd6f0b3ab75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically indicates a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bagstyle.uz/images/file/12833339295.pdf In PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/95101001982.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021911919228700.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/22087595233.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.pdfIn PDF document text
    • http://machulski.com/public/file/mefemogexosis.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/59798560163.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/40494262485.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9e7a00f4---96995490161.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/dakixodinotunuminama.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/vopojunuxos.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xuropize.pdfIn PDF document text
    • http://matras-devison.com/upload/file/81930048041.pdfIn PDF document text
    • https://webaprint.be/img/file/gubilavoranepel.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55752bee6---89752951277.pdfIn PDF document text
    • http://adveotec.com/img/file/44069014796.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/62778200916.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/83971784454.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/70335064764.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/81847903229.pdfIn PDF document text
    • http://htygroup.com/upload/files/zesugelazisax.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nurite.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/11501951230.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310378de22a---86776680922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=9mm+game+download+for+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/tebarutiga.pdfIn 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://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_off0000b83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83D 10588 bytes
SHA-256: c36f9200ca62e439e6175686323b6b5caeb69d97e426b0e338d433a05a785166
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 14976 bytes
SHA-256: e188c119fa67e99fca5da6f446f1bc320fe901a52253ba6d086189f2ecd85b14
font_02_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1