Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031620afdcbf1b3…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 12:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa558ec86d64868f4c93e6fa3c6328d5 SHA-1: 327f4fce7ef1b91f43c099c565c2e7f0fd115fa9 SHA-256: d031620afdcbf1b38f5a0680286a3a9744b5873e3f9c85cc5536a9a28ac2413e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a link farm designed to redirect users to download sites, often disguised with terms like 'download garena free fire world series apk'. Several URLs point to compromised CMS upload storage, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

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=download+garena+free+fire+world+series+apk PDF link annotation
    • https://travelworld.ro/userfiles/file/nalemerinozuxowixugixokaj.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/81209027059.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437b7b3f8aa---gosawumadilakajuko.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/xaruxilibe.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kozigetekagejafa.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/beboruzaxukedeg.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lajirolijirat.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16150e598472ef---dibarixawefem.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jozopexasitelejot.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161490534a28cd---tibowadirekor.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kirulivixogus.pdfIn PDF document text
    • http://techbis.pl/files/file/bivar.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/63dfc9e77d56ce4a1d859684368bf24b/7042289775.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091406262053.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/34705789813.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614702c795958---fopuwe.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/palovisavuda.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/wokuwagabirefigef.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sobewigifaluniroves.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/5924275712.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/fafidizunazapisis.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/dogupidomole.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/todok.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/95850696909.pdfIn 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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 16104 bytes
SHA-256: f7c1662251f98de6ff53566d441c81d0005a66cb70a405de07826f2aa10eb48b
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 10752 bytes
SHA-256: 1e519d9d0dc8ed79b8cccbe34fba91c135eaa0f87d9ad3e016c814417c5ec126