Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ceb5382a07e99…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 22:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03f5ce42146e4396ca9afe71be429672 SHA-1: 7a5fc3f71abee11e4e5722c69ce2b17fd6693ff7 SHA-256: 0b8ceb5382a07e99391335f58073a20fcf77d713673eca26e8546db046b5ceb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ev-owners.jp/userfiles/files/4167517205.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/13b7cdea3b222857b6f483c051ac0ec4/56150532230.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/bumuxopazaxewaro.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d740e0305---56814827740.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161320a55d8c73---40126323344.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/36686726559.pdfIn PDF document text
    • http://akademibt.com/resimler/files/99695577036.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wokasadubifune.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/3451129487.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fatibe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/112ba48bed16a885acd0a2ba50163de6/57414530079.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/bezapinutubajurivuwin.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/17278989438.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/peliridamifinusokaro.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/93587905895.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/susalipoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3a57952d---tuvejevoji.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109040505054128.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/bolalatexirejupavufaseva.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/kadesodo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wuniwujetivaxazo.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/67179903627.pdfIn PDF document text
    • https://hirurgija.me/files/jofozogemoroxagas.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bituwuzikokusexuxiluxu.pdfIn PDF document text
    • https://atlantidegattico.it/file/samilobukanupuredusir.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/68739798719.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tejekifazetixin.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/29870728451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+room+android+1PDF 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_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 10216 bytes
SHA-256: f86280c93a33c1a340212761d2a8f38d5b60bc482fd68cb8d3934f2d2ff72931
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16812 bytes
SHA-256: c42d3c63fc119355b946b78ea18f045100d6a3f4a20e9ae8b0bd4406449c715e