Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2d7a20e785209…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 04:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4e61f00f8260ace83cec6487f23ae1b SHA-1: 08ba9171e4f438e14c3d7e07aaea844a8f8b1c19 SHA-256: f2b2d7a20e785209c40a5a7bebe0a4c873f7c0d7aa767b604788a7c71caf8254
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xapemikudajekajokamevi.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e73e5c3ec---zugavozebimifitum.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hi30i2hbh7agvkh0fggks76quc/sugibadoxelise.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/61012349928.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/64794048942.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/ranukavu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608978a5c0ae1---50686020835.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/diberuxuwodozaw.pdfIn PDF document text
    • https://paperland.bg/uploads/file/noxagitikax.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/vitodozonemes.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1ndslrqujf6opchkp622fk439a/73243084982.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/pudopibikuwele.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/44665690220.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/befik.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca81b7229---44561463143.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8rvdmnbsfofco57tnmdlrn9t3l/75939961510.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/18676330458.pdfIn PDF document text
    • https://puppometalli.eu/file/54819015964.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/249c6ec07c8b09d518ff8111b445f94f/96704241105.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vlnednoaipgshhqovn46qh3qo7/tuwevupigabizudopuwokine.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d3106a40---vaziki.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/49482990467.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/eafe34b5fc37464ff0f9d57e9b528dd9/50755419131.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021528175811690.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/nuwusolajogumis.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004b3ad80a2---7385087749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=good+governance+and+sustainable+development+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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 17948 bytes
SHA-256: 77c9f593ee47fe23c63c444d63b5f38696caa17773141b86364ec3b3250a2314
font_01_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 11308 bytes
SHA-256: e5a6c55dc87da7bcff0252d5fc6e00144027de163f7c60bb3be986b7d58ad090
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1