Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91b117e5acc0564…

MALICIOUS

PDF

93.9 KB Created: 2021-07-28 10:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 029915240e8e1e472c76cf6647f440e7 SHA-1: f33c3ffc400561fba26e6037d9555d3d2b8f371a SHA-256: b91b117e5acc05641b7ef8de072b17b6b23489d8313a293273f22134e7ae1e69
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristics and URLs clearly show a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098c552a87e9---nogejewinumunemijivi.pdf In PDF document text
    • http://mizuho-co.net/file/ck/files/minagowisofapujidaxasedeg.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce878658e---vaximuxuwapufedu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da371349---katavu.pdfIn PDF document text
    • https://inncredel.com/uploads/gimamuzegiz.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f78avhhif49c9l6t38c5fiuus1/16053813727.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6e9b0c7aaaea889ee5dde4c45f454a50/zedotogex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fc7a89156368af3ebf6a37044705bf2f/witopewiripixiguligatuxi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1784c475e---79845387312.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a22e93f2153cc3f2a531548f2c276f81/sefumepedibokimanofel.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/56061d133d4e8189f92f95c1b937f56b/setekinirigimos.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/15625323133.pdfIn PDF document text
    • http://tai-group.com/upload/files/9808830227.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/22677653385.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gd6budfb7mrofq3s52m894m87r/fitarenaxobe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4c438d88---jewoxifufax.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d7b5282e---86330712856.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/petadomakarixom.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/bewagem.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/8644132727.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/97883519780.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86aefa78---28336651676.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/81226063759.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55ec65dfd---40760236410.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269d5508d5---bumuwuxedajom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tamil+new+movies+download+2020+moviesdaPDF 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_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 10568 bytes
SHA-256: 8bca7a37f8dc0cbf228848e48b444a216d85757bf45e243721e364f9fbc85911
font_01_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16732 bytes
SHA-256: d3bc2166506afbfd58948d05a5c8c24d3b4b8477572ce7a9a7e2531e1ecd561f
font_02_sfnt_off00015089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1