Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28283dea0fbbe52…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 04:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd5d5094d4cbca8a1a8a785ae1a627a3 SHA-1: 19cc05d7e6c1b836070a41d726974fbf0a75e986 SHA-256: a28283dea0fbbe5281d2c3aa58f449d257ec4334e7e11af6e04b7bd2a3c6fb41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of a 'clash royale hack server apk' UTM term suggests a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=clash+royale+hack+server+apk PDF link annotation
    • https://www.iieng.org/editor/ckfinder/userfiles/files/duwonukopaxu.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/15770293335.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/14739096287.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/13841991631.pdfIn PDF document text
    • https://kildevangen.dk/files/11025076722.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wamekiruzodosidazikozuj.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210923114039.pdfIn PDF document text
    • http://elitacasa.it/images/file/benajuna.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec0a98c89---53750648990.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/18531378648.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/63970263718.pdfIn PDF document text
    • http://jfe.hk/userfiles/lewukaxigizobi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141317a000da---nelirerumofijevelof.pdfIn PDF document text
    • https://togeltop.net/contents/files/69347006961.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21e1ed471---32912369271.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/volefavezib.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fivufugi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/1523429096.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/6327348925.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/93335159909.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147596d4b511---15473394645.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1fa499cf---jepanuberasawesonup.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443af2a7572---22523394370.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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 18460 bytes
SHA-256: 8dc9fcd33748067ca6609191e674b981b7f5bf5f2f2ea2d3c14722ce509e09d4
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10480 bytes
SHA-256: 0be243fb8b1ac4092b5306fb873926b2aadfe9307b727cb551940f96b356f580
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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