Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a0f2896bb90a33…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 10:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 101be636c3c532ce8271df3da490f79c SHA-1: 84ae61f051fedcf01c1e461f635fbd604ed459f9 SHA-256: 53a0f2896bb90a33341728b909ba3d8cfdcf3cfe71f26a4c36c59ed5f2be73e1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shatalarab-llc.net/userfiles/files/40274621510.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161215f422e2c4---58927221619.pdfIn PDF document text
    • https://noddy.nu/images/file/96081607252.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jqoinv4t9h4i127c06q1jr5n5u/21595846894.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b80712ed---rejifadekad.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/somugawelixinun.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/44363627427.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/239b3db061469ebe06f8a961e9fbe89b/rasevirobuvo.pdfIn PDF document text
    • https://citronel.com/userfiles/files/xeriwoweluzepamoremu.pdfIn PDF document text
    • http://darienhighschool1961.com/clients/6/6a/6a5b14ca9cca6c9c7811e238b5dc87af/File/24970735114.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/pononiboxujoxajubev.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/julivukazuzojese.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9fe3791fd---vobonodevel.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/firumojolevo.pdfIn PDF document text
    • https://designclarf.it/file/zidewigaped.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108220408198871.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/6024209109.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f1a1688d132b3d0dab43197b8d31badd/21359176895.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfbpmn5ja70bpqdnpph5udhc19/3710584216.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60bbc16ace242.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o3v0o7t5o29kp60d90skgg0hgv/73699712078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=orbi+wifi+router+manualPDF 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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10560 bytes
SHA-256: a1a93f3452f57048eba876ecf1dafc5a8d4fed5734ff38b9f297873ae31c9566
font_02_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 16972 bytes
SHA-256: eecdab3d2e42d5cdee0b04fb3682a247af826a7be1b119808c6209f9d084508b

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