Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d05d93599a3005c…

MALICIOUS

PDF

73.5 KB Created: 2021-07-03 04:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a3328b1c1c97539235467dfcd7797d9 SHA-1: 87ae1276c18e8b34de34e84ca0d73d67721f9c0f SHA-256: 6d05d93599a3005cf2cae841bb873789848e0a24d23cedfeb0265dc4e1871db7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. The presence of embedded JavaScript indicates potential for further exploitation or malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e04c46514---17941661350.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb50de82a---10376797167.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/padataluzopezikuweligo.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/8210624556.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dvarl2q177plj2nbmrrplk8nal/36934972953.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e396e3802b---mufadetekorobapitiwasi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/490d61ca67b845c5cc7512da3568a6a7/puboximizi.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/38920403141.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/20/file/leviweselogipiluzitevovo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/e3ppchfjmhrgdugs39rpurmueq/40554798732.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d659792940---buputunufabaxolunu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4687e3615---fimixutabatodowex.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6osjisorfbduvkg2hilupssbh5/soxewoz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9b8a631e---polipexamovetamiruwikid.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/79d368d3e1fb632bf967263c86238c79/gamodakokojukupubug.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0a32150a---99852241286.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/po8jf8sqogsk58nsrglmo1io8g/pusevudoro.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/52623558788.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/53354453213.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aed4e523d---datoxitifegaxovadagiseraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=years+passed+byPDF 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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 10160 bytes
SHA-256: 641aa0e8ae857f5be777fa101ecc5fd3b8b044f894df4a7e1e777a6e6e842433
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16696 bytes
SHA-256: 8d07b420fc49fc0d519b2cf1843390d54b65eeb76c975a01724fed2b8c4530b2
font_02_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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