Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2d9f680ca176f1…

MALICIOUS

PDF

82.1 KB Created: 2021-08-24 10:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c8dcb71d9f8566d6c06b248793862cb SHA-1: 424eae406ae41745d5ef85f9cbb27597d50513a5 SHA-256: bc2d9f680ca176f131a5cc59cab1675fb9bd0e9f73f163ddf4d0011248d6ba54
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://riverside-plaza.com/upload/userfile/files/wifamodakukefukafavijuzus.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c39e3d39f---55721451841.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mifejano.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/68494584418.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44eaaefd9---70609392127.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/447c8362ed9551fc0a5a144ef4ad77a3/wusodubureruweji.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xabefedevagipulewuzatel.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608075b4425a8---lopiwisazadit.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162799062152075247600.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d8548a30---vujololizameziwudas.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/acbf72f77fcbbf99ceba9ac9649c4dc1/motejovi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/592a17b0643b328aa97470e6e325f5dd/vedojapinojivezexofetix.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ab2ad693140d1dd57404065fdfc7374f/zopabi.pdfIn PDF document text
    • http://vaynhe.com/upload/files/92532498040.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdcd279ee---tovukibupuwapuvanefipulow.pdfIn PDF document text
    • http://hidropro.hu/upload/dalokuniluveravejabexuro.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7a116ddf7e07bdf4c97921c7174e7a97/fupekunepiruboledeboj.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xedivobaletovubesasafiza.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0510357535---17440290429.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742960a4fc9---lakewiropalesosa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aos92qu0oki617c0j00k5cn0p8/joserululisexo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/firubomagizitibuvumabir.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/4f95851120a1833fdfafa4db800ca2de/wosaganeluf.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/982e99e0517220d12e4c96e78f6625c1/bebukisinotosizoju.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4b4d3307---18421841418.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/23bd85898b1be23518728ef58278ee1b/5001230853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=find+the+area+of+right+angle+trianglePDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16680 bytes
SHA-256: bf377507878b6640e24c6b91e49d58ac8f17a84fcd5ea394a46a1a62b44295a3
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 10440 bytes
SHA-256: 13afda23396b3db8a9a90a03a5856e9889c295d8ed473f746f2acb4db56d828b

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