Malicious PDF — malware analysis report

Static analysis result for SHA-256 b863f8a058168027…

MALICIOUS

PDF

83.0 KB Created: 2021-07-26 04:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b5ee92b13976c189a7a861b12d9fb63 SHA-1: 012e244f83933af1be10b98893100f7eff4648cc SHA-256: b863f8a058168027844c8f9c7d629718899bc38f7c2168029252315eedc17ab2
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to exploit vulnerabilities or deliver further malicious content. The presence of multiple compromised CMS upload links and disposable hosting reinforces the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7843b4ef66c3a95f4bddb44a940edc/zabekejiligesu.pdf In PDF document text
    • http://perfekttorun.pl/pliki/21182830475.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb41e3cab---92508512119.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/komalofawa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8cf5a046a---61723623944.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/78123030980.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/lidezivabisofujimofovakaj.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3b34af5a79780160778796c28d5f1477/83541346796.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a3815c6870786d866665b2194c45139/89124024161.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce62c44cd54---17865472563.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/57800050806.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lomomu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jisavaxosisubatogetazafam.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gedujigajazivexoxodak.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7928dc6fc64b652c0ab0019291772059/25214518125.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea7458e02---23975761758.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rubebenosowepilat.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2295340ff59adb0f747b312d7c10d86a/bewewibumakoxudevi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3q9avfvtf4nv94v2kn74lbqmv6/92832920088.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf9fde397---zubojasafudoxojabe.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c94412374---67861152137.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/wewasememukoxozesunus.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210706_BC5BDB8C0986F5FC.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1eae37c1e4dce668a01c8fc00f3b319/tubuxoxopoxuxa.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/niraxomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ejemplos+de+encuestas+de+satisfaccion+al+cliente+pdfPDF 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10896 bytes
SHA-256: 2828d015efc124b1724ba32d5d47a05c848d733abe40876434a23a08a7abf127
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 17644 bytes
SHA-256: f3ef49e0be6f8cf670ff3dfb18330daa3558ed6068da18f1816c5357c7d7511a
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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