Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea48088a12b3c9dc…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 11:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 237642cd051d8a0c644785411c14a9e0 SHA-1: dbcccc38de2485daeda7d94d63e2b8bc95d0dcca SHA-256: ea48088a12b3c9dcbf9a3184e346f531819c4a7175fae3d6279ea5ab940639fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wonkingchina.com/d/files/9479356417.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/vaferif.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8945185079.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/konibesivuzokozamerole.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c5fcc411---govamotitopate.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/dotinegemizafenaxegenar.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dn53fnkua7bra0k8c15fselgl7/34430560471.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608239bcc35ca---vujezeti.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/535a5b23b2dc631584402e8404c48d03/29777655235.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/girowuduzijixuwamipumo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d505aa61c---69330264692.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bakomane.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/71026753077.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7fbca1b4---94130279350.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/pezodevedawopojisirotol.pdfIn PDF document text
    • https://isosklo.cz/uploads/manejilixerijevanibalu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c70e64d49---70921832014.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/72118642722.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7e00877c1e2a2deb5197bffe5fb11f64/jugifofonokukolemalulupa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c2e9d3124bd---93335119084.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b839e54e72f5482c42c8c3055f4cdeac/93140545129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=decomposition+of+ferrous+sulphate+crystalsPDF 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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10960 bytes
SHA-256: b1406bbde9eb6e70232298814b6f707e3d9da24091630db3e2cb8f8c3dc86227
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 19076 bytes
SHA-256: 9e516f30fcd6e4243ca00b44651ebb31b3ca5b33a853760f4b74fee542c0deb5
font_02_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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