Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a770f67d7fc1d03…

MALICIOUS

PDF

84.8 KB Created: 2021-07-28 03:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d59c1d0917c369114ff7d6c7422c108e SHA-1: 0350ef3748fe99eaad5207c065bd4655480e3df4 SHA-256: 3a770f67d7fc1d03e027b1e0ebb835f670152b262c3e7737b75e7d6d1513d11a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://andlupa.com/userfiles/file/kukefutomugedofid.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdae849c37---kenisezebumojijabizap.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e520589724---95919373975.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6fmnh2igsuqi2clk9cj1afcq22/jidunavovug.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/sategikuvoveto.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/49986956824.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a26b97fd8cb83d029fbbef5ba8d9e78d/79048202825.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b830d8950---mijebubexo.pdfIn PDF document text
    • https://posh.hr/files/ruxofolekenatobiwikoxezom.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aee62c6ec173f34409dfc35279ce1719/34170321837.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/beneteloxesijariwozitufa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/52923fb0844c252a8dba8f1fc2de7f45/vimijepedogobixutaxud.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/75275594779.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/75fb92558b94337d3954420beda1a257/27220512762.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/32572593618.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cb75a671---sinowitiwexav.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495f44ab02---68615563227.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/pofuraxajodafad.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/tibesilisudosegedobita.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/74886538179.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/14379528202.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db8da01cf---tekogaxiginikaxexosu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/2430853017.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/475698a9e754c39c371ff6b3bc3c539e/fuviwefagakiva.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/53a4866706737c2216d19d96b0dacc0d/37565449574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=reconnaitre+des+droites+parall%C3%A8les+cm1+exercicesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 16968 bytes
SHA-256: b166b3406eea33f5e84a5fa2e1c861c19dfd47f1c58ec44b0652f1f669947a2c
font_01_sfnt_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 17632 bytes
SHA-256: bc8f29f86d7be65dd52fddc01060ed679a97836320e16eacb391f283357006ea
font_03_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 11028 bytes
SHA-256: adb46b46a9c0fd642110eb29149d7c8afb08964586be3a8eff76b037ec52a147

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