Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93cdbb1d1ead30d…

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 13:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: facbafca00f217df6ecedf17a7b690cc SHA-1: 366b891bb10139f65d9fe6b2fb4fa62a0a9ace7c SHA-256: c93cdbb1d1ead30dfb24440babf9d3bc36aee0cae5522c5c2a4fb11c48f6df19
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, some pointing to compromised CMS uploads, and exhibits characteristics of a link farm. A critical heuristic indicates the document attempts to lure the user into executing commands via the clipboard, suggesting an attempt to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://groupunsur1.com/contents//files/nemezerutatetag.pdf In PDF document text
    • http://svaz-podnikani.cz/files/file/43604114580.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sc41f5t528di1b3d15rq20v0gr/zisixojomivugiwujuvikoxeb.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdd385166---42204500311.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/xaxuxififisowa.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/giwamoz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35accec8f---wadijo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/jovirebinizubofitedezi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8f306d3f2a92fa39c99f3c750253a606/lavadolojuzuw.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/8145777523.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca24476b80---zozapenogefojixozitofib.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44011cf4e---vomezarisuzakisisewubidax.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec0bb231b---19777245134.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/66572fcf7d28a46fa88f3a6ffa313ac4/fazusopinuruxedaw.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/famupoperugajarelurepune.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d1f5b6ec---80116804424.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4ab710d5fa6432998ef24df0c021e3ad/satelubaxazipotore.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/duwesomipusudowu.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/51325723411.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/89432a0f8d74548b46057fe10ece8e67/nubibarejeriwop.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/98bahetrb2q49h416hp0jl3587/73337855567.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4k0ehd7ag6s8vg0jemrsj9i3fe/radubezutawixijim.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/kokigagow.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/0ff9bc0b1eb0ec1a755714444dfecf80/wugutadawuloru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+mutant+mod+1.12.2+downloadPDF 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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 18744 bytes
SHA-256: dd5b70ad0c69c089fe7dc28af9e278de96df60840ba5997350fec7e387e63e87
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10888 bytes
SHA-256: df7a003a6f3b744ceea70319eaf0de8ebcde87dee349b9adfa649d430e73b51a
font_02_sfnt_off000133e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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