Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35fd58af8b8c06a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 08:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8faf1ad3772135fb9ebfaff935f100e SHA-1: 04b546e08bb286f1b739b93fbfd8f2e0bd40f4e1 SHA-256: e35fd58af8b8c06a26e8513014189b22d6fb8647e326305473365318a478181e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics point to a link farm strategy, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malashealthcare.com/userfiles/files/71669425896.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/7899073454.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/54940606025.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/5280142354.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143416d0edb0---35737887553.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/dogemebimenoromegebu.pdfIn PDF document text
    • https://dafelia.com/files/burulerubilukajibegoji.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/90940254314.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8275e8de8912acf0c5cfd1e911dbfd3f/pedot.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/sopuditari.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ae6842be2a7f1e5bcf97447da07a946b/52796536145.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/piwapujadupowokenixij.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/fuzadifuge.pdfIn PDF document text
    • http://ping-property.com/user_img/files/24052313118.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/86108079247.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/82956580455.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/55431561090.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/18600139582.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/26701042849.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cebabdb6c7---vubomeduvufiz.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fuvoliwidibada.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a220f273ea---pelidopozodevavanajedo.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jejifixoxumajitoja.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/nozijaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gamebater+sex+gamePDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10372 bytes
SHA-256: cf21e3032dc636448ed754a839a4d6c4f07aa3e8e09504ed2af7eae7f913d238
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 18212 bytes
SHA-256: a570b5eaf14bf6cb1dd91210d925ee0fa70cc2c6dbf2dc202aa62e33d8924a2e

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