Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc77bf63e175c917…

MALICIOUS

PDF

81.7 KB Created: 2021-07-31 02:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f32b12ea6a50e22af6356a6021c3df11 SHA-1: 0bcdc4bf976d745f2bf794b40caca8711aee7674 SHA-256: bc77bf63e175c9170926f468ea427a5bdde4be55935fa1f992198f28e166c359
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URIs and link farms on disposable hosting reinforces its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+apply+for+green+card+for+parents PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a772bb4b8---tovinitererurusovozilu.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/4288605518.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/92d97dac93bf2b04a142c06ef908fc87/purajamuvisaziwizetevine.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd3b26ee1674a4408f3d5a3a15a5d394/razigibukubo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f97553aef---gokebomuxadirujalojaj.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/4980488604.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/67704092909.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/56725289610.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7c6c1b08f97edcc030c1e6f3f00d2e85/zugenapuso.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ec091bdd904e209aabeb2ed0ebc96963/nikemuzu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fbca155148c86d210f87ddef6f60fe5a/magetariboxifujef.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/70844949699.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7d062aa4d782a1693eb92a1ee505376/95034316983.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zugajiwo.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tajetaretewalizakepiribe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0cfdcf08---kumomovirobo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/zazekenebarabotox.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ea02f99d177bdf66b2ed0c977ca0f21/toxemovovajumixibuvil.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/71df9aa0a73bdcbd71d11ed95f81d40e/desavuwugitumovusimojanok.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xomel.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7b3a9032e06d3ffbe2b630f5d0c9a027/49180912812.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/wuzodagubedevaretotubij.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16852 bytes
SHA-256: 61fa07dc0d1de066d59ee040e91c4045fcea72e241751536661c3f507bb6e947
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 10896 bytes
SHA-256: 112eb3f456840e063fcd494b2c38cc92196a9ba3ca786fe459fe7e6ec7488ecc

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