Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc5f552606dd200…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 08:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d1f49accef4f129ea9510233f937af46 SHA-1: ce4c9e64362aa483e6bc92804fed8177a0d426fe SHA-256: 2fc5f552606dd20028ac96adc236285228971ec826d97fe766e1dde5b9ce3433
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting. The document body, though heavily obfuscated, contains strings that appear to be part of a lure related to 'free office product key'. The embedded URLs likely serve as redirects to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1a9c3dd8b---dozepasiw.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/el1imju7cr5koqt9ndmkn6pg8p/varerorotujufaz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/80f54cd32f26c89188bab25b5e30be36/4827659278.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97e4c5c08---vimobupiselovojobuxen.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/vivufufajagupukiraboj.pdfIn PDF document text
    • http://cutskytools.com/d/files/fogemaninukimopugibova.pdfIn PDF document text
    • http://abroadster.com/files/27302541793.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a025978906d---lowafefutefewejud.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lj1tth1i6rinhn6lkp5nt6r0p3/dexagulakom.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/11545266136.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f18afd156a4ce95937cdb93bbd7eb029/34613073057.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lufazunebu.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/sutim.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814831d4359---42583474760.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/44030435022.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4570af761---744955403.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1fe07fcebf259dfc204575be0aff3916/60250345630.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/weburomolotivojojexorej.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xigobomu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/86960281265.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zoxinewopoluvo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13812814b---5620850350.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8e7002a4---10397887742.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/tusatajufarefawisonilopeg.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094571040a1b---82749128969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+office+product+key+2019PDF 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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 17620 bytes
SHA-256: 8508794040dfdfa953a40d19d52f83acab76b5402a427afa1d626e8ef2261cfa
font_02_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 10876 bytes
SHA-256: 63a5839c58cc8549b693bc9664ee1171dcedee4f193d45df756dcb75dcde3051

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