Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d437030736cdfa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 09:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 768bae01d2918cda6ce17e3de516aada SHA-1: e6ddac99fd90cb3150d228f78a40d93162594eae SHA-256: f4d437030736cdfa3b32a25e0c43393e852500eff4ec2c120e6f8e06f33c3f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'utm_term=us+government+immigration' indicates a lure related to government services to entice users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=us+government+immigration PDF link annotation
    • http://imobiliariaimperio.com/files/files/xasubenuwukedosuxulawi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c58441a8ecda47d4e3a9de55722de/valatexexijamijekaxakorar.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/97828003347.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/71623703598.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/85386362890.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/90081930832.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/57693789370.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e66575e60---sikekudedemelemagogo.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/83587924357.pdfIn PDF document text
    • http://sdds.be/userfiles/file/52419456581.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/watalulegemozukobuw.pdfIn PDF document text
    • http://gerocuki.hu/user/file/52770675318.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fuwefajigij.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pabidamoxokijikinuruza.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/28242772087.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ec7109f4d47537e34dfeeb503e11e069/19611619305.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/bagukagunidadelud.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/79374249781.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/73196500355.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/getofagot.pdfIn PDF document text
    • http://workontext.ru/media/file/33233258250.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/nirap.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/80614724241.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/4959668313.pdfIn PDF document text
    • 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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 18560 bytes
SHA-256: 3843e6fa9ae84e7f010fd6e4a83744bdb6f48d887c198e6a9088436ab73d21a4
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 10480 bytes
SHA-256: 16c031ced373dc8e02f417178247e9c147b9f81c950902f4ae279eeaebdfeae0
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1