Malicious PDF — malware analysis report

Static analysis result for SHA-256 1826a09f18e4b485…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 12:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fda192b70e824de2fd6f7f6814c09e6a SHA-1: b3da37184a21ecff9befdbc63de36a9cceb8c827 SHA-256: 1826a09f18e4b48536db25864987aac74c54173719cac3e432a1f9e004b37465
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://encoyun.com/calisma2/files/uploads/rabuvabelikewobe.pdf In PDF document text
    • https://jokerprod.net/userfiles/file/69276446735.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/36147954445.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/zoteligewilubiguvof.pdfIn PDF document text
    • http://trubaopt.ru/content/file/81775869158.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6bbb8e48---roditenige.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/87703871528.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/gabikadevupefewimuxabup.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/suvorilozotuwopominafa.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowazezuwepomogeniga.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/58758902726.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/48464483780.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/95960238668.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/kulobetipezijejo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130171d6f4b3---7115278433.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/79742974250.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/73fc67fdfe9fac8557251c8f59914605/90263663267.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/24561821109.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/mudurugib.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/sekarawo.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/taguboxewewop.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c55c734284---navodolibamagadulebozo.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/tamigokegiwiri.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904160950.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tadasijajupolezosuwim.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/485ff2df71efe2d5b308d89da596b2eb/mebutavonirodudoniza.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/56295553364.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/14628933141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spiderman+1+watch+onlinePDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10824 bytes
SHA-256: 1269eb00fb67af630a43a7579150fba0ffbe682371a5dc58c5170aa7298ad902
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1