Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa10b28e5200cf2…

MALICIOUS

PDF

68.5 KB Created: 2021-09-10 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67666f4c8829a80b23ca71526f998f12 SHA-1: f3e3165736ba4698c94987835b3935cce1624acf SHA-256: 4aa10b28e5200cf2560d59be3ddb4abcc7e12dd802bacab8f9dff011902ffa9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://navigator-nsk.ru/userfiles/file/galovokugazodinaxid.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/47705989266.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/56464573481.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gfmnnl20mnmt2i6mn0bhvj2b52/pabokureto.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v5kjn0hh44u0avvrh0ggstf2ag/sorapusawutag.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/bofidekinudirodagokotal.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/pizewajufewabudigulowabe.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sipegategububim.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/jimiv.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/nezugazonikisobemetole.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/wigorosabami.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/rexotuwoxagud.pdfIn PDF document text
    • https://red-adlay.com/upload/files/piwavosonapi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/sanexivedekeponav.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/15723530154.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/2369702393.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/wejofiboxanijova.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sikil.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905083707.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d1d56bc3e0ae916dda565588d34dcff2/ralopisenu.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/solesewogegiditapude.pdfIn PDF document text
    • https://atlantidegattico.it/file/fafizagupagomagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+8+plus+is+good+for+gamingPDF 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_off0000ade7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE7 14760 bytes
SHA-256: 9320896ee53a1511ea14fd596174427f15a9a29ce4c8183eae8752c1f9c3b443
font_01_sfnt_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 11104 bytes
SHA-256: f7c23ecaddfba843b7a56dcec934523be1567ed7cad204194ffa1687eb6d63f9
font_02_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1