Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfee02aa830e86c…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 17:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bd84c0c4c9adafa81296084eecb3612 SHA-1: 7224e1cd36c8f85f41e6e00f1c40e5c93a8febc9 SHA-256: ccfee02aa830e86c20ac731ae3f043f40bb131a65bc7de53cee5d122097117a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised WordPress sites. It contains numerous external URLs pointing to potentially malicious content, suggesting an attempt to redirect users to phishing or malware download pages. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=name+of+element+present+in+quicklime PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf48e797e1---dawuzabolutotil.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/dotun.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab87e9f94b---vepor.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/daaae259a75e5e10773f4b28587fbd7a/xuwonedinijisibonuvi.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/98684397763.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zaxexeripukijupixole.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210516145833.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991795048ad---16098754782.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dikisimowuxalevunesu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210624025508414730602.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5q002lcagd98i57tcki7ppjk6u/89442138750.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5gf92f2r7euuepao1lme9kl60/29479101280.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/82df401e5b94d332c2c75534a96c67bb/vabaruwezixesoxigatuxom.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/nenovita.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vexute.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1mmemqij6m2es01r8vtqhhtca6/86030896528.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c61rqlosla6rqvud3468a422c/sigigupubugasiwaro.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/31068764219.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c39f9742e---xegavefolutozobamivat.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/7943385206.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/09ee0cb533cb4f618c2595670c97bd3c/6259849411.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821badf11b1---jagonujatulir.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pavisewironigazi.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zofugadudukodave.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10956 bytes
SHA-256: 840517680837128a0c5c01ead79e176d46f2329915a12247a657806ca0e4d39e
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 17376 bytes
SHA-256: c8bc762187753131f2abaf16e2185b08e9530808e36b4962fbd660fbc780e701

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