Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0411e26a75972bc…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de0fc6eeb822052c81eb87dc196a0d70 SHA-1: 51f4267554875fdf5ed3aa66323d28cf19d636a5 SHA-256: f0411e26a75972bc1739d811633a273b9022e51cc85ba411d7be91d9dfd8dd83
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy/paste into a command-line context, suggesting an attempt to trick the user into executing a payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://daglichtfilters.nl/ckfinder/userfiles/files/vorisaxalifanosufaluxuna.pdf In PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/42200499965.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/93958161389.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/pojanemefuje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137377b0bd73---57646417556.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3133f21f---28311923033.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/90421188576.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xevagerojulabajo.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/67366676526.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d430e840f8---87065803709.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/46552952074.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/robumefesevolitodo.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/66112029200.pdfIn PDF document text
    • http://belst.by/upload/file/30374770765.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///raxonovixen.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/nuverazojovutumelemiso.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudufebomel.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c846cfe89---nimulutirenoboboveluj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/44195327681.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b40194c32---pewosatarolakutu.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/89458888357.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/47361793358.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/88246288903.pdfIn PDF document text
    • http://ihdbd.org/upload/files/baragapopaxi.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914110101.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/61226108556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kali+linux+in+android+without+rootPDF 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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 18532 bytes
SHA-256: 9a365d9fec1c10c15f778244ad0ac50fde3e705b01c40710f85eeee53aeb015a
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 10324 bytes
SHA-256: 53d2a8cdbba831bbc4a9e98abc4abe5058e3dcb08ecbf3a9b277d0672c5c479c
font_02_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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