Malicious PDF — malware analysis report

Static analysis result for SHA-256 962b508ee1064c01…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 01:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9095d3f9143353562296dcd056ea36dc SHA-1: 0521d42cc0882c1183df59d39e10de45e8d71169 SHA-256: 962b508ee1064c019d12ffe37268807418d49d44388f07b1e8eeab1287cb83d6
104 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it leverages compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hilimall.ae/uploads/files/loboxiwagukuvubusanezif.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/11477d88b7146d127573a69dd1bc6a8b/xaluxadomumup.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c7634039---xamenojegotuwivovijuwux.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/10315739450.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/besolareve.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db8f3f8c150---15776932820.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/24899917756.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-29/20210629030955598942.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/nuvurunolagejaribokas.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/desijurinudiko.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fikiwelopixuruzuxiw.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/nudakezenekaratefideto.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/34c95341829911e14e253937377ae901/54810556145.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vt3htjcac69t5ln5riielrdubp/jenanizefabegirefejonowa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a96db491679---borotamalajipifaxunow.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6623bd17b---73238349432.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinuwonarol.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/7145482511.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/a15a3e038af37880ff76259dc31f685a/rulisarofe.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/duluburoxibutuxilafip.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/gujepo.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/gonoximevarerod.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/pupekikarebedawebatuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cloze+test+questions+and+answers+pdfPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 19808 bytes
SHA-256: f9acc91bcf0624dc20ffe02142bc7411792ba8f8f51b61f003cccf78ec203a74
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10912 bytes
SHA-256: 3fab88545e4b2eb4610fd108d8cde4e887de77e757225db26406ce98d19c7d08

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