Malicious PDF — malware analysis report

Static analysis result for SHA-256 636647e6c1ee6176…

MALICIOUS

PDF

98.3 KB Created: 2021-09-07 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 609be11eda4d7229ca88432ac75a8026 SHA-1: c893624e245d23802a8f11b9fc89c9cf3d80f19a SHA-256: 636647e6c1ee6176d6a9dc857edfe78f12576568cbf784154e7cab797632d385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hq047nomgc5fr0pobnlcjo44cf/ramowanukow.pdf In PDF document text
    • https://www.xyoaa.org/sites/default/files/files/8371959957.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/49293323028.pdfIn PDF document text
    • http://lesura.net/userfiles/file/89321406132.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/38816013235.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3il7fif1mvgof06anhuos30v03/xowenapivuj.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/lukotugofetojun.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/41014719990.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/56959059843.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/jexokasetevofavakutafi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h23vg5tbaep50d9uhkdcliuk0r/kubetotu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/73546989513.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zokatitapakejafaxexemog.pdfIn PDF document text
    • http://vhktn.at/images/content/files/74671093020.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160707121105bf---deduwupunakawafapobexe.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/39594129061.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vqqkngmghdrplv7brgtu4p89tl/sirabidefugamida.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/33021024296.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed32e60---70865590860.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/64780352112.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/ponalamageb.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6de46ef5---livoxibalutafapi.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kivavuxupukatodijujukowor.pdfIn PDF document text
    • https://chineseclothingonline.com/File/12110610245.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/funifer.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wanosagovetosomafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=word+problems+involving+systems+of+linear+equations+worksheetPDF 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_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 11680 bytes
SHA-256: d4dc172ccb214ec8a44b714dd6f4c31c419e15cde1f2a557e13e0f30133a36f4
font_01_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 20252 bytes
SHA-256: d6c500085e487cbe4b911dc8c0bc38a8bf42a5789222ca666df252eedb9ae971
font_02_sfnt_off00016232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1