Malicious PDF — malware analysis report

Static analysis result for SHA-256 220de861757af081…

MALICIOUS

PDF

97.9 KB Created: 2021-07-15 14:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd4985b22f456d338dc01327ddd00a80 SHA-1: 1ebc5e58d7f8cc8a44481b3f4a897074452a9b02 SHA-256: 220de861757af081470d518fd4e9cc382dff581ae66644c3674c216a9b7ae485
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and heuristics indicate this PDF is malicious, likely serving as a callback phishing lure. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads, suggesting a link farm designed to host or redirect to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the presence of numerous external links and the 'SE_CALLBACK_LURE' heuristic strongly suggest an attempt to trick the user into initiating a phone call for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://webvitamin.vn/app/webroot/uploads/files/67948749700.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754ef69435---21912031968.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7053652d---miwusidafuwudalasig.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7926cb8294134ebc566f2d9da791b865/fabitabageguda.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eea561e54---62458191549.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/4489774952.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d97ab46c4---25958789147.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6q7fo195m20v72uee7441csvl4/fopela.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3a1c4064---katev.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/31fbe5f1a89b7da1dec263e831b104db/pesofafoxowafukep.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/25939058396.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/roxededom.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7c256b131580a419a90544886a806112/1218420293.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/xasaxubokofed.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4c1e9d69---xofisakabesukerodobajovi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/53881598875.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/vedapakexevib.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62b8be86b---tomozusulumowojetuvoz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d120b0c8c0133ae0692562ac6228af9c/94857786137.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/96058285037.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/55940602772.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160896a839a758---99418228682.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/28011015043.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9595cef7---50751135940.pdfIn PDF document text
    • https://2acontractor.it/images/file/gizopiw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/468baa7edc98c6574f8da23e536cf888/mikajaluxovirugawuzagom.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/98256139472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+simple+living+guide+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_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16824 bytes
SHA-256: 7788eee2f63f697ec146783257eafad045e2706bcc83b4a8f24523465458d405
font_02_sfnt_off000160ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EA 10596 bytes
SHA-256: 0682f731f0ecc0279eeb520a6cbe5ba8799511b55be968b93e9fca46f4354541

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