Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24fa9889df91d1d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 07:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a18ecf27b85b97cca72927af7768a65b SHA-1: e06278320ff461c313b5519924ac416f6ba2bf45 SHA-256: c24fa9889df91d1d5454df491baec12a62969a336443ad3870a8de6d10dde5df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=perfect+piano+free PDF link annotation
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zaruva.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/geregoxig.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e9f5a01b940723e4e56263fdcf50dcbe/36809227531.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vadav.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3e136d100fa816d082676d4c55dd0f97/lojuxizikugiver.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93153663641.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367df7aaa38---muratadipijivopokegoxape.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xuxuxagewazanodilesoxizu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2180ed354---96761786297.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090805240293521.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/sezibisijusodabeveradume.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/66077443010.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/18391290340.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/togelagagefituses.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/kovelow.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/68882221007.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/51154732133.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/buvajoxi.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/48516918425.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/xojigosazijat.pdfIn PDF document text
    • https://funke.be/data/file/menizatu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/pavuzubifum.pdfIn PDF document text
    • http://strahyi.ru/images/file/mejotudasinibobot.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wonirusozo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614288968d2b4---vejufekixawugijugig.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/jugemugijozojezaleko.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161340bb347509---bovaporiweka.pdfIn 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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 10260 bytes
SHA-256: 4788710f4abf700e12b861ac48795211a6c425747b99344aed1882e74b937d36
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 16288 bytes
SHA-256: 5c766779055646a6137c1343540bb2ba257d5eba1764e6ca854a40ff18c3ec0f
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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