Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c47217e6db522f4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 19:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52d2fd960a9b24e3f289005f08032567 SHA-1: 6cfb34b0395fd6350f514736435aa89df7ddddc9 SHA-256: 6c47217e6db522f4289bccff3bc485051c86ed21c17b32e93f645df0f369a67c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, including a ClamAV signature for Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=visualizar+un+pdf+en+c%23 PDF link annotation
    • http://primaria-ciocirlia.ro/media/file/luzavupijonadolim.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f150d3ee---74798767369.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2bcd1b6f---68468967030.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/nufivubibevirozufibojem.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/79372800252.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0h8ui1tj0iarl0j5dro4s0knc9/kefevujurofojifesaniwuxi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mu6ig6ca26pv9oepv6vs7cgl44/rogomorirusoweto.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/81fb31d2419871ce9d1cebd99b0a7230/26575785753.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/764a9452b7b0a1ed045ea7bfd81c200e/jemixagolize.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/nitudimilinaga.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/xabavudovorudenixopovo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae516e6893---36673652615.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/48966651740.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a235ea45---4725185839.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jn53tu0vlpp05sijq9bnjisi8s/44165169632.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088733bc351f---salizakuvoz.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39035658505.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/3572737272.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/tovewosedutemaxapulaki.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/47309604541.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_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 18876 bytes
SHA-256: aabd4e5c8d93c3234a6c3eedc25e98d80b89f92ddaca4bb5876b59c204136fcd
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10524 bytes
SHA-256: ba20c2731e2280aa4433c2138bc1deeafb2a6a2410c374466dab77199b968d2f
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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