Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57a4e2677b3ea3a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 05:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99b65cb6e108020519a66dde25fbf76b SHA-1: baf1b05d5d32ec6299acc0c7fd2163302514b625 SHA-256: f57a4e2677b3ea3a9750614252941b7ddaac8a802f77963df7e07bc4ab570d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/bcb0b9cf79b36aadd193b3c660aaf7cf/tuzikaj.pdf In PDF document text
    • http://toanthinh.vn/webroot/img/files/6265399008.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/11570840bad87c67978fa7f5814afc40/49439913624.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a67e1ded57---60586201849.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/28306546973.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vavaxamij.pdfIn PDF document text
    • http://lawngo.net/fckfiles/vuniresikagukidoko.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bidimudagosunorudisofi.pdfIn PDF document text
    • http://sjhtractor.com/d/files/xixefufalirawotagetiw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb378340f5e---rixezalaforuk.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fafedokijipavavi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/luxubikinan.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/96216518215.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087163cdca26---33203199700.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5844cb4d479eb9199f6aee1ead8b8728/nixewuxifane.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/88967037195.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0388e32e---fikukiruku.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/ratametof.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49452322291.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ops9vdc56pi5l6vroqjfpv5svu/61205675927.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nnkgl03vip8as6lfuul9113qr4/toxojilidusepu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210823224634.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mrih09cp35s18nua1e68g2k5f2/timukexonofewovi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/56743704817.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1u46blggm8pnkh4tu3gbircn30/goguxoduvo.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pozegarot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=traktor+s2+user+manualPDF 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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 18068 bytes
SHA-256: e65b6468971ae30d91965455f5eb0945b448ffbe89ba77f0afd277eb4179a718
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 10452 bytes
SHA-256: eadf42f755e0c32bbca034b27348c5c98e3d10fe4e1497ffe104fe0e64aa4caa