Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7d6c7c2079b3e1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 21:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30d8bbc6c982820b17cab284e9ba645e SHA-1: a3bf87dd4aefa3e62c62059fc7ed3b626ce66f87 SHA-256: 3e7d6c7c2079b3e12eba16b204da61fecedd83e1eeabd5286ca4dd14727d8a07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. One of the embedded URLs, https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=123movies+2020+website, appears to be a redirector. The PDF also contains embedded JavaScript, which is often used to execute malicious actions or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d74c6d5bb2c8fcc0a154c57baa52c4e2/lazegudure.pdf In PDF document text
    • http://icsbc.ru/fuploader/file/69178123111.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kozumagukar.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/59581336724.pdfIn PDF document text
    • http://popmetre.com/news/files/78100149497.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/34454656711.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/fadulebitivefawo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf66487d18---9445872939.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/64537906918.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613770cea0a79---tuxivowurekowikol.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/83642ac801b0993f25770116b2061862/1894289009.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/rivitabu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/69913458440.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a63fa8427c---zefarovipaz.pdfIn PDF document text
    • http://seritour.com/rsm/files/lijobazelinov.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/47797810125.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/11704142377.pdfIn PDF document text
    • http://ipublicity.cz/data/file/jifozewarobowunobokizok.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/67708317551.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wisixik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=123movies+2020+websitePDF 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_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 18156 bytes
SHA-256: fc747a00245589b11773c83421197ab5c9ecaf9081ec4bb82811fc087f7593dd
font_02_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 10516 bytes
SHA-256: 1c34919ba52fa6486e48e950e220fc39aec9ebb52f731eba4a6aff96aaeab86e

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