Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2afd692e3f3d918…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 19:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fc23889b74b9950a8d69d775d058102 SHA-1: 30e39a39172efb7847fd49ced7b7703e55fd7276 SHA-256: e2afd692e3f3d918522dbec6799145c47f9181b990b966a4c7b86abefb274f92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/13345523227.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddfbab4be26924f35d75d0337f8539de/dinifori.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273f1d797f---fufaxale.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7fe29d6a40b9c4409694e060e002a8d2/73863344749.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/24385866623.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/a464eu71v0n7cs42f6sk36siat/nobegupadesobo.pdfIn PDF document text
    • http://hflchw.com/upload/file/givajowikoga.pdfIn PDF document text
    • http://whatdwellswithin.com/file/4349801997.pdfIn PDF document text
    • http://mylodge-naoshima.com/razoguzededazagijasil.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/80620027799.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/puzapumop.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/49029711350.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/76710423433.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vekiwurejuku.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/lebudimomuwefala.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c6a6fe38cc60d7384db8ce0f6b235a0c/nevifisuvadebez.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrth8raghq38ol22olklmomqvp/kesozonuraj.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/zixiwum.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/jadenamefen.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210724_184425.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/40237546937.pdfIn PDF document text
    • http://aimic.com/userfiles/file/61167686078.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/99440708367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=occupancy+agreement+pdfPDF 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 10776 bytes
SHA-256: 4b77c1671caf24b1e91b7060d4437003b57312826d152c388274554cd51fa91c
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 17280 bytes
SHA-256: b466e3ad734102fcfb4ade46213d114b4b72fcfcb7105877f0e64046e9f4dd8a

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