Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20d07f8587d8257…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 00:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 814782fd61c3dc5a2766fb9e21e41b88 SHA-1: af80d7fb8f4dc817714275d4351de1ad0cdc390d SHA-256: f20d07f8587d8257e14bc30c461396f28b9da5ca70d2d5d3ea7777b61df1f9ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link with 'utm_term=download+minecraft+java+edition+apk' strongly indicates a lure to trick users into downloading a payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=download+minecraft+java+edition+apk PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed9e6d612---sabog.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/48090074982.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/lixibofefugu.pdfIn PDF document text
    • http://tencanpowder.com/d/files/57883296604.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/puxisix.pdfIn PDF document text
    • http://labotinnghia.com/img/files/727004104.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zevopupadikokotokeki.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/satagamakagoxo.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/75151198462.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/42662368218.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b88627c---53583162244.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/420de3c236c0e753f76e982a85ee7d18/xiromezurusa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/41993038645.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/gotivosomusawo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/58561607496.pdfIn PDF document text
    • http://juha.be/_files/file/logopukakumuriv.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///pabopogogupujosupoze.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/nugilekoruvanirojo.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vifilale.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/92634761750.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/87165632663.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibidari.pdfIn PDF document text
    • 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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 18664 bytes
SHA-256: 0d131c409ce6bc899893005dab97d2bd16d884110a7ffe8b9276e21dfe046a49
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10988 bytes
SHA-256: b8ecf7248e6ea1d9fc84972b1b3332b66d90aad5ca25b769c0227d98d1f9a24e

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