Malicious PDF — malware analysis report

Static analysis result for SHA-256 c389d4b4379efd1b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 17:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 859bd114a257081648472a5bd07594b2 SHA-1: f8f897691bb7809859af3f7fb6559297c7771474 SHA-256: c389d4b4379efd1b23b20afa19af613f1fd771031af068d1ee242099b67762c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zulabalatepexewuvi.pdf In PDF document text
    • http://compow.net/ckfinder/userfiles/files/totagawubegafubebukobim.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/8702775922.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/14806154711.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/76656547777.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/giluzifozenisitalid.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wavipojudaxifutox.pdfIn PDF document text
    • https://theipbuzz.com/images/file/gukezamilemujilodazin.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/togawesutanofepafibazuxu.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/17886327364.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tojaxukutonuxejawiwoza.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/xomoxejuzo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5eda037a57a77b8046ed23810ab83a41/jixanowubesekapiwa.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/bekugomeg.pdfIn PDF document text
    • http://epplast.com/files/file/tazabiwavebulobinuweji.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/18467984768.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89236426065.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d32847313---15830544166.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/91797765702.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27e78b7790e76c25d2036701244624b0/vepogiginikewesar.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/2025621083.pdfIn PDF document text
    • https://fuoriscena.eu/file/lojatunemegabudekibu.pdfIn PDF document text
    • http://xtra360.net/campannas/file/rifafizogobilonojidaf.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vpn+apk+crackedPDF 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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 10044 bytes
SHA-256: e2ba89383e562c00f6efb1877670ef925c0deceb2ed1e4dfffc46fea0804915c
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 15080 bytes
SHA-256: 4d1818482bbc0da678189fe69d61f1e7d07c964ee83f6729da43ff962c59ba09
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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