Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c27ccc422fb9347…

MALICIOUS

PDF

84.1 KB Created: 2021-08-02 05:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b57f453ba6934133fee19ae1892d9365 SHA-1: 259d047d35d0ddb7ab42d977d98c591241a3fd57 SHA-256: 7c27ccc422fb9347831718b280939565e9c41843dd0f442c31561c7342f8e533
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or phishing lure. The presence of a 'download' button heuristic further supports the idea that the document is designed to trick users into clicking links that lead to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=11th+biology+question+paper+2019+answer+key+half+yearly PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81c74ae91e6c6aceb06e54d6639752c9/98163853798.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160803aca4dade---pikuxijatazanugexerar.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abeecab171a---peritobubepuwofixajijut.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/96652942808.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sunupepesukewexajopibaj.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/zafibuxadekuxamokusu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ukrafo0v9hqn42m3pefv21jia3/numimenod.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/8429987567.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0c5434bcad4bf315f5407e6e912bc077/fapekebonan.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/89562958427.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4fd5e975---67351076063.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/68496830684.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a96391f3d2e---niwijizesugi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6f77b091d7db729387714f6992b1841d/95962265679.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74590276442.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3s3khfu9bkc9fj1a15ranphft0/53215141799.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c253fe0871---xuxujugopolesisisufojutop.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/sitilitizokarit.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/3fd933007c0d44515622024ae7a6328f/13290934406.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fc3e8eb0---wiwodowubogojutoxo.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/sewutaxoxaw.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/44q2m6l4bm9retirhq78arp9t3/fifedikigi.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/komosarovopemabola.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9bb82c82---laxevuvepakexafamisovogo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/78568267770.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9ad8da84---mezezanelokugudimumubasu.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 16728 bytes
SHA-256: 0d87f6d1448a323966ade9fd65619716504e001d06b157105b0fc3f6415442f5
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 11680 bytes
SHA-256: e5d6e47cd25f695788960407fd30f72557c48e7a77063c2054c1476b4cdad01e

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