Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9114abb1ae7661a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 13:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be9d42d5752b1e0e1fe2f72b512fb7da SHA-1: 85f250836357410dd256ef9135ac2d7b692613d9 SHA-256: f9114abb1ae7661ab4d0239b3688d1ded3f2fb6dd40c45dca2d31614d956119c
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links appear to be part of a link farm designed to redirect users to potentially malicious content, likely for software piracy or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=tourist+bus+simulator+free+download+for+android PDF link annotation
    • https://www.agencesramos.com/ckfinder/userfiles/files/voduja.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad64e1d161---96843604861.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mizexoripaviloweroguxuwe.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/reroril.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/70563412849.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/gabifemimefifevika.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/51362379937.pdfIn PDF document text
    • http://pvvc.cz/files/tirumuze.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/tupegatuferewab.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a9587ff7e6687cfda67832adeb98c897/72678541922.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/vedebinivoda.pdfIn PDF document text
    • https://olterus.com/contents/files/25842255314.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/mepazujofab.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zifuwadolofutegup.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/vixarezofigemot.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/tarisekapixiruj.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/57040071685.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/65401166475.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gezawud.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/81301541941.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/51979025804.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404344d3b43---38316144876.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e871b736ea6c393fe3efe8f06e86d08d/61170415540.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_off0000bbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16592 bytes
SHA-256: d316197c307abe256f7fe0db0693a80c793a710b31976c9356b1a41438a0d8d1
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10804 bytes
SHA-256: c337305ab69935458b6b533fd03c2d61dd2b206c5a5da63c96a03d23a0e655c2