Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca5f20124d61aff…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 22:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 011b5b38193e30408c30ce132b59b3c7 SHA-1: cf5b734b30d403f5f811aedf847c1716c8b93707 SHA-256: dca5f20124d61aff8b346e4b84274577d953dcded53c779047357e6dfcceafc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=drake+and+josh+season+2+123movies PDF link annotation
    • https://bedandbreakfastchia.it/userfiles/file/nuvufagirin.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/xisuloxeluwawivigepak.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/46200757167.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widafezipogesusejij.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/82986258675.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/43008023151.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/juxabunesevugero.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d2b3d11df33db04084b9682f16222c0d/96215509597.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e04d96418a29334289595a9ca87b60db/18571006219.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/37115380994.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140015cb0aa6---53762211972.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/71570631413.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kadubome.pdfIn PDF document text
    • http://africareview.in/userfiles/file/81803612511.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/sokovaxisenixaxiruxu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/rotoxarezovepezul.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27957856196.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/99740220935.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb430db8b0---17383442860.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/69822368853.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/75341047871.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/jarupedaxegebana.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/jaxevuveveris.pdfIn PDF document text
    • 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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 17532 bytes
SHA-256: 296ff4cf943948a0b48209814acf8355792e4ac5322507e0a10d1cdfe5e57fe7
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 11000 bytes
SHA-256: 5b363e993b3dedbb2749b47b7edd4098f5cf9a0530edfc097c7f0f34cf252f2e

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