Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca33e6a89e5bb58…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 01:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48c25261993e4ac300fe9409078fd881 SHA-1: 704b907e4af398efb25ee796faa34740bb1e4580 SHA-256: 0ca33e6a89e5bb5858f938e39db76410e0c3885b3560f595ae3434b4a7dbaba1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://e-tta.com/app/webroot/userfiles/files/69858438803.pdf In PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nefunefovulipeg.pdfIn PDF document text
    • http://trovas.com/userimages/rowabiruf.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/77253248140.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lubezesovolupenanixawujek.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/jefomosexugezetaxesu.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/17058906517.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608861fc4f5a6---35739306412.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161200b6e615ae---nuwome.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749df50843c---sejaloditebabeluwudiwoke.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a1abb80e2b330cee3d3fa8d2e3880155/fovasilesuzab.pdfIn PDF document text
    • https://renault-service.com/userfiles/89707976426.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/gafivefogitano.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/gidunipifuxubupilisupere.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31ee31a7---41196340111.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/kukerikolaposemepaxok.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lalasazoragizamipewoj.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0f030bd4e---fevogifemikewiru.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/guxunofiruwagapamobubakog.pdfIn PDF document text
    • http://change4best.ru/upload/file/numaxeluzeveruri.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e57bf990---kojap.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/zawewimefuwofiwagaz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b875305614f---mokepibalubefigoji.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kajasukemaxeminusofikosuj.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/60d64a7a6cd003efbd0c56149922b3bf/wibawi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/dudosemajefegojudobepuwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=keeps+you+hydratedPDF 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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 10452 bytes
SHA-256: db01568dd09cdafc21e28a5a1d44dbb4078c193ba6a882e995869e0b22dc6eeb
font_01_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16760 bytes
SHA-256: 9def958a5b4ba5accb87c499ae2305deb90c82cc0a7f38554c624faa192ec4c6
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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