Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eebaf545865731e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 09:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a4fb224e682248354f2bce8ab9919a3 SHA-1: 540814311dd9768231f0174877b291684ac8513f SHA-256: 0eebaf545865731e279625d10c9799fd921ae0aef44be1d59a1e6b00640d521f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. While no scripts were directly extracted, the PDF structure and URL heuristics point towards a malicious document designed to redirect users to harmful content.

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/o6ek5043skbv6unmifb7jku81r/kazajosaped.pdf In PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210625002638.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/paboroxuvixusep.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/aa0493754ec0a43e64af8a40b8af1982/ripuxujikafalugepunedigu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/32778985388.pdfIn PDF document text
    • https://schmitz.cz/res/file/pumatudobum.pdfIn PDF document text
    • http://samtekelektrik.com/files/97691306094.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609668fadc40e---rawowupawerenare.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/91f5eacc116e8a1db688385a32a5916f/43278680086.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b817e8863b6---xopopuma.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479da4cf30---2595496166.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/2508241831.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/41938704446.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad487bffb---kafedojabuvogejero.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/jajuvirosumibitijixudabad.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jewepi.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/koluwudavidamokasumag.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/luxogabegoresopuru.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/54996463747.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210803050846_te4ecc.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/sixazipivafegimizol.pdfIn PDF document text
    • https://asi-filter.pl/files/file/koxigujatufifiluzixunubo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/nidugudizegiwetejabafob.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/86432909796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=toshiba+satellite+laptop+manual+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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 17472 bytes
SHA-256: c8554d8bdcee9957e170a42c5603ba61fd44a1ddc143487b3228fb89c95c7b0f
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10868 bytes
SHA-256: ab4c9314f53c6dae505bed359038932dcc0b0b926f5888933977af17763fca67

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