Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51c77757e441dc1…

MALICIOUS

PDF

90.2 KB Created: 2021-07-24 12:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 30e8e669bcbbb585b8ad483e7060ac90 SHA-1: f0961032a6be4c40869e462b5c05fe4dd7110453 SHA-256: b51c77757e441dc1b81806222ef1267aed4672f40092d172261fc6453336e91e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abb417dd06d26b2073242414cf813a0c/68831461190.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096f07c5dc---ponesafosakivajojegodemo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/kutaniwanemixadefut.pdfIn PDF document text
    • https://proia.bg/userfiles/file/30973953481.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d709770742debe8c278368dd735a71fb/86661946308.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/lalalefemezowoxor.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/39c74ad8b558d64490ba9e233692cbe1/gizakipafi.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/nofopidifewowidej.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/35441046576.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210613015115_ucpyfg.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lazexezukijufemevumogiluz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/jazogapusas.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e9ad93a14d33f1c125e2161b81f25a61/wosumavinubomi.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/81689993829.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aae410c847c1784cb52509ec2e543091/jexukomegejilujapas.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vokigofe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43d5b0a30---lufutubu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6998761f40---zumumefobimo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f58ec722d3ab75297226bd56be8f0a8f/43125426014.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b7b05c32---52876106598.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vuwugitomonejas.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2081b36194---lekurizaxarofuvizute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=el+maquinista+pelicula+completa+en+espa%C3%B1ol+latino+megaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 17252 bytes
SHA-256: 5930901347abb1c74794e76c08f98f19e0809896d87d251be594d754d230ca89
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 3008 bytes
SHA-256: e81002e42100a570cb3341bff25bcc2638f07d68264b1fc715e15cb32bae3484
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 11052 bytes
SHA-256: d0c4d5db37fe638c87227aa39024cf28c4fa932d0fcd4c338373f91d2a8f0564

Open this report in the interactive analyzer, or submit your own file for analysis.