Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5b498581c05395…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 01:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e350802930d82eb499e58d8af57731b8 SHA-1: e19539c24c99da69a2e4c8051a981bbeeeb55adc SHA-256: cb5b498581c0539555581faaba708a22d07e1e808eebbb67afe1cbfec9f24600
156 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to multiple compromised websites that host further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to compromised CMS upload directories suggests an attempt to leverage these sites for hosting and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e53jpc4fnhurvao0aj986mk205/38317038831.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0c43bc2ac28d1a2506feb1a483eaa517/tifujevidisatuxejapiwumil.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/dewanixatifetoxigusegul.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070cd59da25a---16843471800.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/83529493076.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/wirolumoxobap.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/83699526208.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809aa24008f---92444527767.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/punafamawuwapukeki.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075802c0bedd---24281750121.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607106045be7f---bibex.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/polulukunokawozenover.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e372f5ffef464c183739454cad382d51/64028674550.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/77724320052.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dk4bddu3jkg83iibajm8mi7da1/32102004313.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/70526494111.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976bf188c28---giludetapaga.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/jevumilisujibemujan.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa7b36674---korepexa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6e67ead2d8182a15e855f2ebd55febd/27630676370.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5903f8ecd1---66444022133.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c6e191ff---kasot.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/pogapo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c164ab4a36---33946551141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sneaky+pizza+delivery+sivirPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 17684 bytes
SHA-256: d84a93b9c15f0aa3a878f976e6d15714f036ee82577f956676bd409f585b4522
font_01_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10576 bytes
SHA-256: c50332a93beeca1d54ee3b92a01ff53deb3055d2d76483c6c51923cea36c748d
font_02_sfnt_off00013ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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