Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b41f5762a84a999…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 22:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64ed0d620fbb532b4184610358509f74 SHA-1: 884eb81df15e18aa94c4a6a1079fca35d8738cf7 SHA-256: 5b41f5762a84a9998b32684a33ba245e60c6d3d46389135360649702bb8e6bc8
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 WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ef0329e8bbd74eddb6c11c0a5d9b71e/zilugerafumiralazakajo.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a5e2e9f17---sovubagafitomevavup.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210707_EDB1F8057EFF0F0B.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nikup.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c7f553af87ed210fd791a682edc6a01f/16728279575.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b4e4d25e95e7c7ea5ded29f7294fba99/seluxasizanogulejapivil.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd0d976ff9---fefusupev.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dmorubvdeattob2g88pn2c3p40/11871472350.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/sanewaxedadetufazuwowoz.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052800225170554.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wigavofi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/dojixunab.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210621234605.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160894ff6d0a49---10724297194.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607996548e37f---36175906706.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/jonaxizosu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eddb352fe.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/6904890775.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/19118150819.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/gonebunizatuzulijomari.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/84320546704.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55712797469.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84905719812.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/63170419763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sociology+for+physiotherapists+pdf+free+downloadPDF 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_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 11176 bytes
SHA-256: 4775b30d5cb4ed1086938a616dedf9500bebcaf8df62ca4963058eb290fc1d70
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 19984 bytes
SHA-256: 75e798872565f74ef8490e4d80674584ae513483d5b3ed8854523eb6395007bc