Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ddb2caccede34…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 21:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d172ac00f914a3b5aa9d7c33ce267f9 SHA-1: f777ba17baddfbf21d6279f4c173ec480ed88213 SHA-256: 833ddb2caccede34459d6d4aee88fa893639281fd0347b2294aa3a5e9701c229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=strategic+management+concepts+and+cases+17th+edition+pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/folave.pdf
    • http://ontsgoi.shop/uploads/files/937850675.pdf
    • http://syuncyoku.jp/upload/file/73095655505.pdf
    • http://banphimchuot.com/userfiles/file/mukififojuwaron.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a0d25b93---koxekoj.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082241c1ac0e---xowufefibiw.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ada5fe3b521183164dccaf41d6e791eb/lukunanatovozuligivolexud.pdf
    • http://ildongwire.com/userfiles/file/pupejejadil.pdf
    • http://gfhs1978reunion.com/clients/56625/File/35489988486.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30262461207.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21a2972a5d---sijoxuderusiworexumumo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7b8adf89---80782820417.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/nulusepamapelo.pdf
    • http://chongthamnguoc.vn/img/files/51111146291.pdf
    • http://iwishop.hu/file/50129453301.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f7252c18---46877271086.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0240be77---84788001331.pdf
    • https://aglogistics-bo.net/userfiles/file/wufujalojotivosenu.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/jijujemogodisa.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6104610381.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5a59c0738ccc54d244c90786a37889a1/1497751039.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/gaponajipilaz.pdf
    • https://abugfreemind.com/userfiles/file/89170909446.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b6675b88670---14990796459.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1200c9b8b3---5791770413.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 16792 bytes
font_01_sfnt_off0000fcb2.bin
04821db69459a540fbf1720a0613db140e5deecd630dd5be717e833a9755955e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 11200 bytes
font_02_sfnt_off0001168e.bin
9c703fd3b7b23ecd4e834a47ba3b072cb484a91b08515715a53a232a929afcbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 17520 bytes