Malicious PDF — malware analysis report

Static analysis result for SHA-256 528f4e90bb307ee4…

MALICIOUS

PDF

99.0 KB Created: 2021-09-03 18:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: abcfec0d83fa2435631f2a54cd1c6b71 SHA-1: 9b1924ff70b0878c608bc57443e55e20efffd198 SHA-256: 528f4e90bb307ee4386c8670c8d2ada57b8f1f54c056fa2fd6b9e22336759ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a lure to download malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://anaminfo.com/attachfile/file/tumumo.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa423003d47---34133878764.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/xofuna.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e095c3f0d653b6f4a9a7d447caa8c2e2/32733169982.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f81ccdb26---ripof.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/segefolitukiwalezibaz.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/muwuvixezoxusekuxo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebdb851b4a---81493583989.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/47568135893.pdfIn PDF document text
    • https://fototipia.hu/files/files/palorozozuxawo.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/46830560760.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/pajuvazuvija.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2facfe0ef7b76f188dfef4eea4d46dd1/bepet.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf6779162---mepuzupodis.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1362f3eac51ea9800cdcc7bd1dcb7669/lotisuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1b3186b66---32982282280.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/90710579337.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf77cc308---devunobezivejabuxun.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/pozonabigejefode.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/todavabudetibariva.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/pitenuro.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/47357423058.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/de5e6a13048cbd86d22d334a4b5adc5d/fikugosivaf.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/49209219917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kingdom+animalia+class+11+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_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 18740 bytes
SHA-256: d399e07270a9277d4b521152a9b79fe2b4948c5ba935138c28802ed17be86e00
font_01_sfnt_off00014db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB9 10676 bytes
SHA-256: 6cbe09fe88568b94e7cf92a4e56829685856c6745776fc788d3f15b264636c9b
font_02_sfnt_off000165ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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