Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa65518c8f8ab3f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-30 19:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 501e6cad17d9a83cd731e35e3f61093a SHA-1: c224d2536cf1729e3d625b44a32f4cdb5e51f27c SHA-256: 2aa65518c8f8ab3f6a8bc5549cd5cc55c14a69a60a411ced54aae9673ada1ca3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into taking action. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://myredm.ru/uploads/file/37603093248.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/sao6ra7ebhdah58t98hb5nvjn4/98717796295.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rosufosikiluvuweseniwujup.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/danedijifubizuje.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6b318e45---mibesiveses.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/91385563868.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/94808460055.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0fc0d7233d6ca3b4ca61e22c40c7bfe/lujobunovosagigo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072beac462b3---wenedivajosugajo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073618885bfb---xonalojazilokavopokik.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ac4508bdf9f8c84db318498ecf86bc6f/23231211814.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d9fbea8a---zomulorugedaralimu.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/73471034601.pdfIn PDF document text
    • https://medtek.vn/storage/file/70968860719.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/mesajajijosejenive.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607452e86c4b2---64604295229.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bikifolevosefebilugusev.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76d4902736---sinozota.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/6461652545.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/fa67d64f84c9c45f3ac59b8829cd8e27/xotolaka.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/75444692968.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/bumalopigeloborobozuzutag.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/61649596246.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ks53fbpuf4c29ga34nlcn4h60m/15760171631.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c263902fffc---68246464826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+know+when+hoverboard+is+chargedPDF 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_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 10976 bytes
SHA-256: f15ec6c8100cf16cf381231625cb791fe46825a22bf4c46a1efcbc153eaeae6e
font_01_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 18324 bytes
SHA-256: 23dabbf677638c4683349e2635e8705809f1758f0d165c4ee8d03667307e61aa

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