Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c6e9ae5a39eda6…

MALICIOUS

PDF

76.8 KB Created: 2021-07-30 00:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cccde0ee74380d2979e752141d5ed99f SHA-1: 9c17eda44b6a1fab0bd0f2582869bc9f75dee09e SHA-256: 51c6e9ae5a39eda6246f955fbdad6faa1833818a2a85151d174d3838e10a66c8
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://envomask.com/wp-content/plugins/super-forms/uploads/php/files/398f10a95422094694ccf70ba4746779/96897671047.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/6ms5fbq7gc0chgjddidt0pnpm1/71966517427.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/9762747296.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/4372577828.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589ff8f3ce---79742130579.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61419230477.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c91fe21ff---36036270846.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gozelilotitag.pdfIn PDF document text
    • http://araonline.hu/uploads/file/muriv.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/98478016491.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d33a98e2f2530f8f605636df7efb2fa6/likoweve.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/59958192226.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b25613dbebe492e37c15fc7bd9a4f860/17997694167.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0bc079fa511e4ac3c5fd096ad1bd1b66/12951498860.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8822394f83---dixinuvogigizitogozaretet.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38401056697.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1fd343d318b429a04418494de32d6f53/22882105516.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efc9b13e47---81950809186.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/43338471421.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/norid.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/mibapipimofulefepikujuv.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/novepukekov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ppg-14+butyl+ether+chemical+formulaPDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 11176 bytes
SHA-256: 538a340cf5f93ebc73d322b949d9c0ed1c0a1a651f4dc70984a00bb9fcd92e43
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16296 bytes
SHA-256: c71310e61d48fadc82bb3f34566f7c1b1a11557e9c06281b7944bdf55dadbe66

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