Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d9f5ae6be16c9c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 03:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53ff7f0f00cc74a9ecf3cfb32fceb276 SHA-1: 92caf75aa75c690baa26a683c8f673a65a3118c0 SHA-256: 64d9f5ae6be16c9c2139185a57a7e0b682818f4fbf0c4f9bf0cce898552a3762
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=volume+of+rectangular+pyramid+worksheet PDF link annotation
    • http://whatifitspossible.com/ckfinder/userfiles/files/30403670251.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fuvikakapisapuvugevagajuj.pdfIn PDF document text
    • https://quizai.com/uploads/files/tojubazixug.pdfIn PDF document text
    • https://superpart.com/files/bebonumokebowol.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/paxadezavixijunapetepa.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/73173833170.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8k0509u8ov5f2fmkhhfh9hsv0o/35102835392.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/46728413729.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/36782288840.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/sozikavofibifu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11518529751.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/75367632174.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3a79d4d61efabe7df1f0f8cdc82f0eba/zelivafirarekekuroluze.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/27382224523.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/84696623052.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910111136086.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/93486065534.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5731c8de---riwoposakuni.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6143f11c5815d.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/mifetedu.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/7559170876.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f490b1b36a---87798200906.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 11428 bytes
SHA-256: 41817853a92fe2796b4e0239cb61de83fa918c988a7e7e45fdb8f0bba3f021cd
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 18268 bytes
SHA-256: ac21ce7bc26768cf482b6ccbcb2a39eb8b8022918df8e0819fc5d3a9fb19bce0

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