Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed900d2726fa25fb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-22 23:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87241303adfbc23f60ff990411d67ec3 SHA-1: f643d424a9c86e29167fd0f29fff77d1b1cb300e SHA-256: ed900d2726fa25fb5aaaa80cd082c9dd3cda0ceba6b7c8b7b6376a7eb716eb13
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm and potentially a CMS upload link farm. The presence of these links suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://wastran.ru/uplcv?utm_term=how+can+i+watch+the+tyson+jones+fight PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65291d326b1f8967e58965d23e2c39b2/dumirulipuwegirurezil.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/9229381600.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/fogimixi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/57475859856.pdfIn PDF document text
    • https://limsurempat.com/contents/files/buwesujulo.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/33607221801.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20453052195.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/85300195730.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xixukunubidoveg.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fd779622---42439024021.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/39950995978.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/43024491750.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/munemazoradedajin.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/waloladujurelujuke.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/21188468338.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dokejatawugadufeterumu.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/vefukoder.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/jatetusazomosowubuta.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jazasawirowiwajusigazatox.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jenifodog.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/65639334558.pdfIn PDF document text
    • https://kaparatt.com/images/File/70551571608.pdfIn macro / runtime command snippet
    • https://limberhurstgallery.com/imageuploads/file/92771139677.pdfIn macro / runtime command snippet
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161495b9649106---befasisubutos.pdfIn PDF document text
    • http://aardbeienfeesten.nIn macro / runtime command snippet
    • 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_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 10788 bytes
SHA-256: f7c5e1bab33addc7a4d67f6e84d0d31aa676f8fd7e1622a1a5ede43043ed02e8
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 18424 bytes
SHA-256: 56c0a32dc1fa42ee8c86bab22134912a57779a2d14c6add375790f4381724e30

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