Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f3141b9587fc6c…

MALICIOUS

PDF

301.8 KB Created: 2021-08-04 08:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17852fddf28adfff473ae3816c57e7dc SHA-1: 678cbf9eea822d58c570423bc3e008023422950e SHA-256: 31f3141b9587fc6cde2bff78f2c47c552ddbbe5b0260146302e8e95933d98448
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9801

Heuristics 5

  • 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.
  • 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 http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b131e966c59a09a39853a5599e8f94ef/walutawazufidadune.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/xomebojewoxipapupa.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/bariguzitegitufizixobit.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f351d540---8883203923.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wizemibok.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/lolemawoxagerubaz.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/9970691058.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/zenobidisi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/35033475cf3c30f7ebaa303364526247/tojivebadotom.pdfIn PDF document text
    • http://belloverde.net/emailer/file/somavutuxijavupavazase.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/rezavovafabepob.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/81477161447.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1886a85a69698703d5455cc1f058d116/22551225237.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/baa5355300e987ce7f53669585732812/wopuxuvodulivujixij.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/45087848334.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4fed091fb69d7f3f6ff6873b2a2cb209/62978751086.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732095ae5f---94980798772.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c5c062ae---36369571852.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///32956406145.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/60106504290.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/74444566973.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k2sn431vtu0hj3k1bd22me3si5/sazixibotawazetazakazif.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/71e300794f5aa756dd3f5fa510df6c80/pamudaxabumogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=guia+exani+i+contestadaPDF 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_off0004400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4400E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00045825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45825 10460 bytes
SHA-256: 1fd3c2fedadfe1445980bd1d46629d083f73a62ecbe49e5e28dbef55d5604f42
font_02_sfnt_off00047013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47013 21352 bytes
SHA-256: c7b1419896fa39b0dae11ea385b3166ea714b0ba7ca23f42f0e04b2f59917886