Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e6c91ac2aaaee…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 15:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56a9f77d9e0dcb63979b25b7a180d2aa SHA-1: 1f850dfd1fe20fa765166a8c19cfaf2f89301828 SHA-256: a33e6c91ac2aaaee06e552a06989105ee86d80b4bd114920c727effabfebc340
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or malicious redirection. The presence of 'cmdli/lijimusilugurutexi.pdf' in a URL suggests a potential command execution attempt or a lure for a specific exploit. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://yarpaket.ru/userfiles/file/wagejutuganavukubobub.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/306987e037d7e81dd1e0e02ecac7e78e/55174194225.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b94fecd8a1d446a3f08490e2b275442/lopojofesax.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b05e78fb3---84499093764.pdf
    • http://chatfieldfarms101.com/userimages/12673024352.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c923ddf9e0e8b99e0a41612118e3fa2f/91951663514.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fq4itqn46gld5lnbu62g1cmdli/lijimusilugurutexi.pdf
    • https://ewt.cz/res/file/59257454019.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b652ce3b5---nigimibemigibixeviwozowem.pdf
    • http://automsystem.com/UploadFile/file/20210628102408756.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fbe13c3b---81000049867.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078028359ab4---virakipatix.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac160997615---64342002482.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8dea11de---petanifotozofuw.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e7c389b087692cd093ecc7485a3b4974/50879757332.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/83830744189.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/of4rtbdbektu8npl64arr1f9p0/42139768068.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/568032071a2ad34d6d42b9d8e4cccb57/15203631177.pdf
    • http://mulroyenvironmental.ie/userfiles/file/93479460722.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ff2cc2c---65477985031.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/aevo7ceog6mo5dv6q8vumetol8/teropax.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8066aaa60---vutam.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2mfbkoo7hm3bttn2e9if61p5pi/kadedafutubukidi.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/85752016194.pdf
    • http://altinay-law.com/images/file/36964926445.pdf
    • https://ewt.cz/res/file/5925745
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+fate+series+to+watch+first
    • 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_off0000ee40.bin
ea68ea4ccae2cafa49a12ec34aad2e4f85faf66289679c824f039fa2148caee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10364 bytes
font_01_sfnt_off000105ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
font_02_sfnt_off00011dff.bin
d88daab5c72b0ec3884d565e79c1ee4e6647ce23412a8bdcba6749fd1c4ad0f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 16704 bytes

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