Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb73e49b2a27b9b1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8c79af93caff3721f2210603341fafb SHA-1: 6c165871f1b34976e54a8f68744c1082268443e1 SHA-256: eb73e49b2a27b9b1dfe401c59e01c48ec27fd9fff8d564384a93d0556efe29b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arendic.cl/files/sajadovufufowubejevaxised.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/15395011625.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/34358328815.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210903032208.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gr82fkseb90n9leruvj9ljtbf0/63844321743.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9160194eb45693783dfa064dc415a50/jajedamosusopitunoture.pdfIn PDF document text
    • http://etnorom.hu/pictures/6314699677.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fotemawazuxaxivigulepuw.pdfIn PDF document text
    • http://cloverdiamond.com/file/tifokunekawezuloxu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdfccd647---nafefafevojijat.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/regazunaza.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_EB73B2491D0A3947.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/561204822.pdfIn PDF document text
    • https://togeltop.net/contents/files/naxazagakita.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/movukuvufowidunulinetis.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/supobutimosofi.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/vubanabokaf.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/govipas.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/69304803984.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gibarevifa.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/74424935106.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuririsatesesogogogimibe.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210915205008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+auto+text+on+androidPDF 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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 10472 bytes
SHA-256: 84a7ea18ac7b76e329577ca1126d4994edb59305e8aa65384b9fd36e0350955b
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 18536 bytes
SHA-256: d57caa0a72244d29c2c1017dea443dec39fb04386cfc40575cf99a53b2de9e62
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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