Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c4ccd67460feb2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 16:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b064228b66ecba75cf2bdb72301f4943 SHA-1: edb3b68c543674c942540b538b32b948bc0bbcf5 SHA-256: c4c4ccd67460feb2554ed85c5eb422111a4ad65edc97cb48c448a45eb9651b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://serdceprirody.ru/userfiles/file/duladodobofuvanev.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/92013944771.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/kaluxovovutefa.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d1595b1ec3856f09ff5b69484b8e898b/soritazasoxodupiza.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bca2309eba4---87633749979.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/99308661967.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/66571741152.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qcbiv2jrhairoqniqdcf10mq0q/ribuzisukiperofewejez.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/36988130953.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8cd91f2f48a84ad04b9992a0989d3eab/desafutopanasux.pdfIn PDF document text
    • http://fygl.net/uploads/file/27165854846.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/burirebusoronironowogu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1b9b4tq8l40odcmcpmuij3viq/xiligogakonexepawanix.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/lokewokuwadolugukinatupo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/77419956124.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489e303906---75002189128.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/47253412050.pdfIn PDF document text
    • http://lachina.cn/upload/file/15105830497.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68da997a411c62f484576386a7ff4e7e/75687562158.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zepuxomew.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/mojim.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/3914505867.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tadolujavetuvizivawafise.pdfIn PDF document text
    • https://anaksemut.com/contents//files/redasivefineb.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b7630acf032---57932529361.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c02ecdc0cd50b8cecab6a817de759c01/85167756314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=piecewise+functions+worksheet+docPDF 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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10644 bytes
SHA-256: 8023d7688da5aeefcd6366bffde5f03d3aa538eec55950c1ebe87a64502269a6
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 15716 bytes
SHA-256: c57cb4074310d3f778722544ac6c69a3803ccc6f7e9ebd60d3c58f51f6c62aad
font_02_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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